diff --git a/services/course-material/src/components/exams/ExamStartBanner.tsx b/services/course-material/src/components/exams/ExamStartBanner.tsx
index a2bd0e043163..030c1fdfadf2 100644
--- a/services/course-material/src/components/exams/ExamStartBanner.tsx
+++ b/services/course-material/src/components/exams/ExamStartBanner.tsx
@@ -2,20 +2,21 @@ import { css } from "@emotion/css"
 import React, { useState } from "react"
 import { useTranslation } from "react-i18next"
 
+import { ExamEnrollmentData } from "../../shared-module/bindings"
 import Button from "../../shared-module/components/Button"
 import { baseTheme } from "../../shared-module/styles"
 
 export interface ExamInstructionsProps {
   onStart: () => Promise<void>
-  canStartExam: boolean
   examHasStarted: boolean
   examHasEnded: boolean
   timeMinutes: number
+  examEnrollmentData: ExamEnrollmentData
 }
 
 const ExamStartBanner: React.FC<React.PropsWithChildren<ExamInstructionsProps>> = ({
   onStart,
-  canStartExam,
+  examEnrollmentData,
   examHasStarted,
   examHasEnded,
   timeMinutes,
@@ -69,15 +70,24 @@ const ExamStartBanner: React.FC<React.PropsWithChildren<ExamInstructionsProps>>
         >
           {children}
         </p>
-        {!canStartExam && <p>{t("you-are-not-eligible-for-taking-this-exam")}</p>}
+        {examEnrollmentData.tag === "NotEnrolled" && !examEnrollmentData.can_enroll && (
+          <p>{t("message-you-have-not-met-the-requirements-for-taking-this-exam")}</p>
+        )}
+        {!examHasStarted && !examHasEnded && <p>{t("message-the-exam-has-not-started-yet")}</p>}
         <div
           className={css`
             text-align: center;
+            margin-top: 1rem;
           `}
         >
           <Button
             onClick={handleStart}
-            disabled={!examHasStarted || examHasEnded || !canStartExam || disabled}
+            disabled={
+              !examHasStarted ||
+              examHasEnded ||
+              (examEnrollmentData.tag === "NotEnrolled" && !examEnrollmentData.can_enroll) ||
+              disabled
+            }
             variant="primary"
             size="medium"
           >
diff --git a/services/course-material/src/pages/[organizationSlug]/exams/[id].tsx b/services/course-material/src/pages/[organizationSlug]/exams/[id].tsx
index 702e3c195dd8..124f88e94ae9 100644
--- a/services/course-material/src/pages/[organizationSlug]/exams/[id].tsx
+++ b/services/course-material/src/pages/[organizationSlug]/exams/[id].tsx
@@ -32,7 +32,7 @@ interface ExamProps {
 }
 
 const Exam: React.FC<React.PropsWithChildren<ExamProps>> = ({ query }) => {
-  const { t } = useTranslation()
+  const { t, i18n } = useTranslation()
   const examId = query.id
   const [pageState, pageStateDispatch] = useReducer(
     pageStateReducer,
@@ -65,6 +65,15 @@ const Exam: React.FC<React.PropsWithChildren<ExamProps>> = ({ query }) => {
     }
   }, [exam.isError, exam.isSuccess, exam.data, exam.error])
 
+  useEffect(() => {
+    if (!exam.data) {
+      return
+    }
+    if (i18n.language !== exam.data.language) {
+      i18n.changeLanguage(exam.data.language)
+    }
+  })
+
   const layoutContext = useContext(LayoutContext)
   useEffect(() => {
     layoutContext.setOrganizationSlug(query.organizationSlug)
@@ -172,9 +181,6 @@ const Exam: React.FC<React.PropsWithChildren<ExamProps>> = ({ query }) => {
     </BreakFromCentered>
   )
 
-  const canStartExam =
-    exam.data.enrollment_data.tag === "NotEnrolled" ? exam.data.enrollment_data.can_enroll : false
-
   if (
     exam.data.enrollment_data.tag === "NotEnrolled" ||
     exam.data.enrollment_data.tag === "NotYetStarted"
@@ -188,7 +194,7 @@ const Exam: React.FC<React.PropsWithChildren<ExamProps>> = ({ query }) => {
               await enrollInExam(examId)
               exam.refetch()
             }}
-            canStartExam={canStartExam}
+            examEnrollmentData={exam.data.enrollment_data}
             examHasStarted={exam.data.starts_at ? isPast(exam.data.starts_at) : false}
             examHasEnded={exam.data.ends_at ? isPast(exam.data.ends_at) : false}
             timeMinutes={exam.data.time_minutes}
diff --git a/services/headless-lms/models/.sqlx/query-695a949ba3558ee7732376d21552a497407519d4909f24c6590b20ba41445e86.json b/services/headless-lms/models/.sqlx/query-75fe56282c6af47368ee23356b63f50e4c178421366e983326dd8bcb290dd713.json
similarity index 84%
rename from services/headless-lms/models/.sqlx/query-695a949ba3558ee7732376d21552a497407519d4909f24c6590b20ba41445e86.json
rename to services/headless-lms/models/.sqlx/query-75fe56282c6af47368ee23356b63f50e4c178421366e983326dd8bcb290dd713.json
index af129e414638..3d1906805b6d 100644
--- a/services/headless-lms/models/.sqlx/query-695a949ba3558ee7732376d21552a497407519d4909f24c6590b20ba41445e86.json
+++ b/services/headless-lms/models/.sqlx/query-75fe56282c6af47368ee23356b63f50e4c178421366e983326dd8bcb290dd713.json
@@ -1,6 +1,6 @@
 {
   "db_name": "PostgreSQL",
-  "query": "\nSELECT *\nFROM course_module_completions\nWHERE course_module_id = ANY($1)\n  AND prerequisite_modules_completed\n  AND eligible_for_ects\n  AND deleted_at IS NULL\n        ",
+  "query": "\nSELECT *\nFROM course_module_completions\nWHERE course_module_id = ANY($1)\n  AND prerequisite_modules_completed\n  AND eligible_for_ects IS TRUE\n  AND deleted_at IS NULL\n  AND id NOT IN (\n    SELECT course_module_completion_id\n    FROM course_module_completion_registered_to_study_registries\n    WHERE course_module_id = ANY($1)\n      AND study_registry_registrar_id = $2\n      AND deleted_at IS NULL\n  )\n        ",
   "describe": {
     "columns": [
       {
@@ -90,7 +90,7 @@
       }
     ],
     "parameters": {
-      "Left": ["UuidArray"]
+      "Left": ["UuidArray", "Uuid"]
     },
     "nullable": [
       false,
@@ -112,5 +112,5 @@
       true
     ]
   },
-  "hash": "695a949ba3558ee7732376d21552a497407519d4909f24c6590b20ba41445e86"
+  "hash": "75fe56282c6af47368ee23356b63f50e4c178421366e983326dd8bcb290dd713"
 }
diff --git a/services/headless-lms/models/.sqlx/query-a20713f03a272294f8134ee1dba5e327215625cc98568daff6691f879928bf4e.json b/services/headless-lms/models/.sqlx/query-b97c13a86038590133180f6c54b1d4948ebef79cf621af73610ee427652f231a.json
similarity index 76%
rename from services/headless-lms/models/.sqlx/query-a20713f03a272294f8134ee1dba5e327215625cc98568daff6691f879928bf4e.json
rename to services/headless-lms/models/.sqlx/query-b97c13a86038590133180f6c54b1d4948ebef79cf621af73610ee427652f231a.json
index 9730a9313d90..1e993c60ac9e 100644
--- a/services/headless-lms/models/.sqlx/query-a20713f03a272294f8134ee1dba5e327215625cc98568daff6691f879928bf4e.json
+++ b/services/headless-lms/models/.sqlx/query-b97c13a86038590133180f6c54b1d4948ebef79cf621af73610ee427652f231a.json
@@ -1,6 +1,6 @@
 {
   "db_name": "PostgreSQL",
-  "query": "\nSELECT exams.id,\n  exams.name,\n  exams.instructions,\n  pages.id AS page_id,\n  exams.starts_at,\n  exams.ends_at,\n  exams.time_minutes,\n  exams.minimum_points_treshold\nFROM exams\n  JOIN pages ON pages.exam_id = exams.id\nWHERE exams.id = $1\n",
+  "query": "\nSELECT exams.id,\n  exams.name,\n  exams.instructions,\n  pages.id AS page_id,\n  exams.starts_at,\n  exams.ends_at,\n  exams.time_minutes,\n  exams.minimum_points_treshold,\n  exams.language\nFROM exams\n  JOIN pages ON pages.exam_id = exams.id\nWHERE exams.id = $1\n",
   "describe": {
     "columns": [
       {
@@ -42,12 +42,17 @@
         "ordinal": 7,
         "name": "minimum_points_treshold",
         "type_info": "Int4"
+      },
+      {
+        "ordinal": 8,
+        "name": "language",
+        "type_info": "Varchar"
       }
     ],
     "parameters": {
       "Left": ["Uuid"]
     },
-    "nullable": [false, false, false, false, true, true, false, false]
+    "nullable": [false, false, false, false, true, true, false, false, true]
   },
-  "hash": "a20713f03a272294f8134ee1dba5e327215625cc98568daff6691f879928bf4e"
+  "hash": "b97c13a86038590133180f6c54b1d4948ebef79cf621af73610ee427652f231a"
 }
diff --git a/services/headless-lms/models/src/course_module_completions.rs b/services/headless-lms/models/src/course_module_completions.rs
index 0061bad16051..6b07a32b884d 100644
--- a/services/headless-lms/models/src/course_module_completions.rs
+++ b/services/headless-lms/models/src/course_module_completions.rs
@@ -2,7 +2,7 @@ use std::collections::HashMap;
 
 use futures::Stream;
 
-use crate::prelude::*;
+use crate::{prelude::*, study_registry_registrars::StudyRegistryRegistrar};
 
 #[derive(Debug, Clone, PartialEq, Eq, Deserialize, Serialize)]
 #[cfg_attr(feature = "ts_rs", derive(TS))]
@@ -541,25 +541,42 @@ impl StudyRegistryGrade {
         }
     }
 }
-
+/// Streams completions.
+///
+/// If no_completions_registered_by_this_study_registry_registrar is None, then all completions are streamed.
 pub fn stream_by_course_module_id<'a>(
     conn: &'a mut PgConnection,
     course_module_ids: &'a [Uuid],
-) -> impl Stream<Item = sqlx::Result<StudyRegistryCompletion>> + 'a {
-    sqlx::query_as!(
+    no_completions_registered_by_this_study_registry_registrar: &'a Option<StudyRegistryRegistrar>,
+) -> impl Stream<Item = sqlx::Result<StudyRegistryCompletion>> + Send + 'a {
+    // If this is none, we're using a null uuid, which will never match anything. Therefore, no completions will be filtered out.
+    let study_module_registrar_id = no_completions_registered_by_this_study_registry_registrar
+        .clone()
+        .map(|o| o.id)
+        .unwrap_or(Uuid::nil());
+    let res = sqlx::query_as!(
         CourseModuleCompletion,
         r#"
 SELECT *
 FROM course_module_completions
 WHERE course_module_id = ANY($1)
   AND prerequisite_modules_completed
-  AND eligible_for_ects
+  AND eligible_for_ects IS TRUE
   AND deleted_at IS NULL
+  AND id NOT IN (
+    SELECT course_module_completion_id
+    FROM course_module_completion_registered_to_study_registries
+    WHERE course_module_id = ANY($1)
+      AND study_registry_registrar_id = $2
+      AND deleted_at IS NULL
+  )
         "#,
         course_module_ids,
+        study_module_registrar_id,
     )
     .map(StudyRegistryCompletion::from)
-    .fetch(conn)
+    .fetch(conn);
+    res
 }
 
 pub async fn delete(conn: &mut PgConnection, id: Uuid) -> ModelResult<()> {
diff --git a/services/headless-lms/models/src/exams.rs b/services/headless-lms/models/src/exams.rs
index 4e3425b1c1f6..1a8812afd479 100644
--- a/services/headless-lms/models/src/exams.rs
+++ b/services/headless-lms/models/src/exams.rs
@@ -9,12 +9,14 @@ pub struct Exam {
     pub id: Uuid,
     pub name: String,
     pub instructions: serde_json::Value,
+    // TODO: page_id is not in the exams table, prevents from using select * with query_as!
     pub page_id: Uuid,
     pub courses: Vec<Course>,
     pub starts_at: Option<DateTime<Utc>>,
     pub ends_at: Option<DateTime<Utc>>,
     pub time_minutes: i32,
     pub minimum_points_treshold: i32,
+    pub language: String,
 }
 
 impl Exam {
@@ -60,7 +62,8 @@ SELECT exams.id,
   exams.starts_at,
   exams.ends_at,
   exams.time_minutes,
-  exams.minimum_points_treshold
+  exams.minimum_points_treshold,
+  exams.language
 FROM exams
   JOIN pages ON pages.exam_id = exams.id
 WHERE exams.id = $1
@@ -109,6 +112,7 @@ WHERE course_exams.exam_id = $1
         time_minutes: exam.time_minutes,
         courses,
         minimum_points_treshold: exam.minimum_points_treshold,
+        language: exam.language.unwrap_or("en-US".to_string()),
     })
 }
 
diff --git a/services/headless-lms/models/src/library/copying.rs b/services/headless-lms/models/src/library/copying.rs
index 76751d7cdb6d..cf8e8a742528 100644
--- a/services/headless-lms/models/src/library/copying.rs
+++ b/services/headless-lms/models/src/library/copying.rs
@@ -271,6 +271,7 @@ WHERE id = $2;
         time_minutes: copied_exam.time_minutes,
         page_id: get_page_id.page_id,
         minimum_points_treshold: copied_exam.minimum_points_treshold,
+        language: copied_exam.language.unwrap_or("en-US".to_string()),
     })
 }
 
diff --git a/services/headless-lms/server/src/controllers/course_material/exams.rs b/services/headless-lms/server/src/controllers/course_material/exams.rs
index 9b1568f28670..7a2772da9d21 100644
--- a/services/headless-lms/server/src/controllers/course_material/exams.rs
+++ b/services/headless-lms/server/src/controllers/course_material/exams.rs
@@ -81,21 +81,24 @@ pub struct ExamData {
     pub ended: bool,
     pub time_minutes: i32,
     pub enrollment_data: ExamEnrollmentData,
+    pub language: String,
 }
 
 #[derive(Debug, Serialize)]
 #[cfg_attr(feature = "ts_rs", derive(TS))]
 #[serde(tag = "tag")]
 pub enum ExamEnrollmentData {
+    /// The student has enrolled to the exam and started it.
     EnrolledAndStarted {
         page_id: Uuid,
         page: Box<Page>,
         enrollment: ExamEnrollment,
     },
-    NotEnrolled {
-        can_enroll: bool,
-    },
+    /// The student has not enrolled to the exam yet. However, the the exam is open.
+    NotEnrolled { can_enroll: bool },
+    /// The exam's start time is in the future, no one can enroll yet.
     NotYetStarted,
+    /// The exam is still open but the student has run out of time.
     StudentTimeUp,
 }
 
@@ -145,6 +148,7 @@ pub async fn fetch_exam_for_user(
             ended,
             time_minutes: exam.time_minutes,
             enrollment_data: ExamEnrollmentData::NotYetStarted,
+            language: exam.language,
         }));
     }
 
@@ -166,6 +170,7 @@ pub async fn fetch_exam_for_user(
                 ended,
                 time_minutes: exam.time_minutes,
                 enrollment_data: ExamEnrollmentData::StudentTimeUp,
+                language: exam.language,
             }));
         }
         enrollment
@@ -183,6 +188,7 @@ pub async fn fetch_exam_for_user(
             ended,
             time_minutes: exam.time_minutes,
             enrollment_data: ExamEnrollmentData::NotEnrolled { can_enroll },
+            language: exam.language,
         }));
     };
 
@@ -202,6 +208,7 @@ pub async fn fetch_exam_for_user(
             page: Box::new(page),
             enrollment,
         },
+        language: exam.language,
     }))
 }
 
diff --git a/services/headless-lms/server/src/controllers/study_registry/completions.rs b/services/headless-lms/server/src/controllers/study_registry/completions.rs
index 004d6420b52b..2fa41259e4e0 100644
--- a/services/headless-lms/server/src/controllers/study_registry/completions.rs
+++ b/services/headless-lms/server/src/controllers/study_registry/completions.rs
@@ -25,6 +25,12 @@ use crate::{
     prelude::*,
 };
 
+#[derive(Debug, Deserialize)]
+struct GetCompletionsQueryParamers {
+    #[serde(default)]
+    pub exclude_already_registered: bool,
+}
+
 /**
 GET `/api/v0/study-registry/completions/[:course_id | :uh_course_code | :course_slug]` -- Get completions from all modules in a course.
 
@@ -37,7 +43,11 @@ during transmission, an error message will be appended to the end of the broken
 
 This endpoint returns an array of [StudyRegistryCompletion](models::course_module_completions::StudyRegistryCompletion) structs.
 
-# Example requests
+## Excluding already registering completions.
+
+If the study registry has already registered some completions, it can exclude them from the results. This is achieved by adding a query parameter `?exclude_already_registered=true` to the request. The value of the parameter is a boolean, and it defaults to `false`.
+
+## Example requests
 
 Using University of Helsinki course code:
 ```http
@@ -56,6 +66,12 @@ Using course id:
 GET /api/v0/study-registry/completions/b3e9575b-fa13-492c-bd14-10cb27df4eec HTTP/1.1
 Authorization: Basic documentationOnlyExampleSecretKey-12345
 ```
+
+Exclude already registereed:
+```http
+GET /api/v0/study-registry/completions/BSCS1001?exlcude_already_registered=true HTTP/1.1
+Authorization: Basic documentationOnlyExampleSecretKey-12345
+```
 */
 #[generated_doc(Vec<StudyRegistryCompletion>)]
 #[instrument(skip(req, pool))]
@@ -63,6 +79,7 @@ async fn get_completions(
     req: HttpRequest,
     course_id_slug_or_code: web::Path<String>,
     pool: web::Data<PgPool>,
+    query: web::Query<GetCompletionsQueryParamers>,
 ) -> ControllerResult<HttpResponse> {
     let mut conn = pool.acquire().await?;
     let secret_key = parse_secret_key_from_header(&req)?;
@@ -74,6 +91,13 @@ async fn get_completions(
     )
     .await?;
 
+    let dont_include_completions_from_this_registrar = if query.exclude_already_registered {
+        Some(models::study_registry_registrars::get_by_secret_key(&mut conn, secret_key).await?)
+    } else {
+        // In this case, we'll return all completions.
+        None
+    };
+
     // Try to parse the param as UUID to know whether the completions should be from a distinct or
     // multiple modules.
     let course_modules = if let Ok(course_id) = Uuid::parse_str(&course_id_slug_or_code) {
@@ -96,6 +120,7 @@ async fn get_completions(
         let stream = models::course_module_completions::stream_by_course_module_id(
             &mut handle_conn,
             &course_modules,
+            &dont_include_completions_from_this_registrar,
         );
         let fut = serializable_sqlx_result_stream_to_json_stream(stream).for_each(|message| {
             let token = skip_authorize();
@@ -137,27 +162,36 @@ during transmission, an error message will be appended to the end of the broken
 
 This endpoint returns an array of [StudyRegistryCompletion](models::course_module_completions::StudyRegistryCompletion) structs.
 
-# Example requests
+## Excluding already registering completions.
+
+If the study registry has already registered some completions, it can exclude them from the results. This is achieved by adding a query parameter `?exclude_already_registered=true` to the request. The value of the parameter is a boolean, and it defaults to `false`.
+
+## Example requests
 
 Using University of Helsinki course code:
 ```http
-GET /api/v0/study-registry/completions/BSCS1001 HTTP/1.1
+GET /api/v0/study-registry/completions/BSCS1001/caf3ccb2-abe9-4661-822c-20b117049dbf HTTP/1.1
 Authorization: Basic documentationOnlyExampleSecretKey-12345
 Content-Type: application/json
 ```
 
 Using course slug:
 ```http
-GET /api/v0/study-registry/completions/introduction-to-programming HTTP/1.1
+GET /api/v0/study-registry/completions/introduction-to-programming/caf3ccb2-abe9-4661-822c-20b117049dbf HTTP/1.1
 Authorization: Basic documentationOnlyExampleSecretKey-12345
 Content-Type: application/json
 ```
 
 Using course id:
 ```http
-GET /api/v0/study-registry/completions/b3e9575b-fa13-492c-bd14-10cb27df4eec HTTP/1.1
+GET /api/v0/study-registry/completions/b3e9575b-fa13-492c-bd14-10cb27df4eec/caf3ccb2-abe9-4661-822c-20b117049dbf HTTP/1.1
 Authorization: Basic documentationOnlyExampleSecretKey-12345
 Content-Type: application/json
+
+Exclude already registereed:
+```http
+GET /api/v0/study-registry/completions/BSCS1001/caf3ccb2-abe9-4661-822c-20b117049dbf?exlcude_already_registered=true HTTP/1.1
+Authorization: Basic documentationOnlyExampleSecretKey-12345
 ```
 */
 #[generated_doc(Vec<StudyRegistryCompletion>)]
@@ -166,6 +200,7 @@ async fn get_module_completions(
     req: HttpRequest,
     path: web::Path<(String, Uuid)>,
     pool: web::Data<PgPool>,
+    query: web::Query<GetCompletionsQueryParamers>,
 ) -> ControllerResult<HttpResponse> {
     let (course_id_slug_or_code, module_id) = path.into_inner();
     let mut conn = pool.acquire().await?;
@@ -187,6 +222,12 @@ async fn get_module_completions(
         ));
     }
 
+    let dont_include_completions_from_this_registrar = if query.exclude_already_registered {
+        Some(models::study_registry_registrars::get_by_secret_key(&mut conn, secret_key).await?)
+    } else {
+        None
+    };
+
     let (sender, receiver) = tokio::sync::mpsc::unbounded_channel::<ControllerResult<Bytes>>();
     let mut handle_conn = pool.acquire().await?;
     let _handle = tokio::spawn(async move {
@@ -194,6 +235,7 @@ async fn get_module_completions(
         let stream = models::course_module_completions::stream_by_course_module_id(
             &mut handle_conn,
             &modules,
+            &dont_include_completions_from_this_registrar,
         );
         let fut = serializable_sqlx_result_stream_to_json_stream(stream).for_each(|message| {
             let token = skip_authorize();
diff --git a/services/headless-lms/server/src/domain/authorization.rs b/services/headless-lms/server/src/domain/authorization.rs
index fc42215ffc26..fb18b4c3df0c 100644
--- a/services/headless-lms/server/src/domain/authorization.rs
+++ b/services/headless-lms/server/src/domain/authorization.rs
@@ -593,8 +593,15 @@ async fn check_study_registry_permission(
     secret_key: String,
     _action: Action,
 ) -> Result<AuthorizationToken, ControllerError> {
-    let _registrar =
-        models::study_registry_registrars::get_by_secret_key(conn, &secret_key).await?;
+    let _registrar = models::study_registry_registrars::get_by_secret_key(conn, &secret_key)
+        .await
+        .map_err(|original_error| {
+            ControllerError::new(
+                ControllerErrorType::Forbidden,
+                "Unauthorized".to_string(),
+                Some(original_error.into()),
+            )
+        })?;
     Ok(AuthorizationToken(()))
 }
 
diff --git a/services/headless-lms/server/src/programs/doc_file_generator/mod.rs b/services/headless-lms/server/src/programs/doc_file_generator/mod.rs
index 7ce2a205be82..a242139bb990 100644
--- a/services/headless-lms/server/src/programs/doc_file_generator/mod.rs
+++ b/services/headless-lms/server/src/programs/doc_file_generator/mod.rs
@@ -329,7 +329,8 @@ fn controllers() {
         ends_at,
         ended: false,
         time_minutes: 120,
-        enrollment_data: ExamEnrollmentData::NotEnrolled { can_enroll: true }
+        enrollment_data: ExamEnrollmentData::NotEnrolled { can_enroll: true },
+        language: "en-US".to_string()
     });
     doc!(ExerciseSubmissions {
         data,
@@ -1059,6 +1060,7 @@ fn models() {
         ends_at,
         time_minutes: 120,
         minimum_points_treshold: 24,
+        language: "en-US".to_string()
     });
     doc!(
         T,
diff --git a/shared-module/src/bindings.guard.ts b/shared-module/src/bindings.guard.ts
index f762457d31af..8ce9c25ee74c 100644
--- a/shared-module/src/bindings.guard.ts
+++ b/shared-module/src/bindings.guard.ts
@@ -1011,7 +1011,8 @@ export function isExam(obj: unknown): obj is Exam {
     (typedObj["starts_at"] === null || typedObj["starts_at"] instanceof Date) &&
     (typedObj["ends_at"] === null || typedObj["ends_at"] instanceof Date) &&
     typeof typedObj["time_minutes"] === "number" &&
-    typeof typedObj["minimum_points_treshold"] === "number"
+    typeof typedObj["minimum_points_treshold"] === "number" &&
+    typeof typedObj["language"] === "string"
   )
 }
 
@@ -3115,7 +3116,8 @@ export function isExamData(obj: unknown): obj is ExamData {
     typedObj["ends_at"] instanceof Date &&
     typeof typedObj["ended"] === "boolean" &&
     typeof typedObj["time_minutes"] === "number" &&
-    (isExamEnrollmentData(typedObj["enrollment_data"]) as boolean)
+    (isExamEnrollmentData(typedObj["enrollment_data"]) as boolean) &&
+    typeof typedObj["language"] === "string"
   )
 }
 
diff --git a/shared-module/src/bindings.ts b/shared-module/src/bindings.ts
index 9d804c7709db..1c1f7ffded69 100644
--- a/shared-module/src/bindings.ts
+++ b/shared-module/src/bindings.ts
@@ -488,6 +488,7 @@ export interface Exam {
   ends_at: Date | null
   time_minutes: number
   minimum_points_treshold: number
+  language: string
 }
 
 export interface ExamEnrollment {
@@ -1775,6 +1776,7 @@ export interface ExamData {
   ended: boolean
   time_minutes: number
   enrollment_data: ExamEnrollmentData
+  language: string
 }
 
 export type ExamEnrollmentData =
diff --git a/shared-module/src/components/LanguageSelection/index.tsx b/shared-module/src/components/LanguageSelection/index.tsx
index c7345805da4d..2bb531bb7bc5 100644
--- a/shared-module/src/components/LanguageSelection/index.tsx
+++ b/shared-module/src/components/LanguageSelection/index.tsx
@@ -53,6 +53,8 @@ const LanguageSelection: React.FC<LanguageSelectionProps> = ({
     document.cookie = `${LANGUAGE_COOKIE_KEY}=${selectedLanguage[0]}; path=/; SameSite=Strict; max-age=31536000;`
   }
 
+  const noLanguagesToChange = (languages ?? DEFAULT_LANGUAGES).length <= 1
+
   return (
     <>
       <OutsideClickHandler onOutsideClick={() => setVisible(false)}>
@@ -66,6 +68,8 @@ const LanguageSelection: React.FC<LanguageSelectionProps> = ({
             :hover {
               cursor: pointer;
             }
+
+            ${noLanguagesToChange && `cursor: not-allowed !important;`}
           `}
           ref={setReferenceElement}
           onClick={(e) => {
diff --git a/shared-module/src/locales/en/course-material.json b/shared-module/src/locales/en/course-material.json
index 810652d47151..34e0f169c05c 100644
--- a/shared-module/src/locales/en/course-material.json
+++ b/shared-module/src/locales/en/course-material.json
@@ -102,6 +102,8 @@
   "max-points": "Max points",
   "max-score-n-marks": "Max score: <2>{{marks}} marks</2>",
   "message-already-on-different-language-version": "You're already on a different language version of this course. Before answering any exercises, please return to <1>{{name}}</1> or change your active language in the course settings.",
+  "message-the-exam-has-not-started-yet": "You cannot start the exam yet. Please come back later.",
+  "message-you-have-not-met-the-requirements-for-taking-this-exam": "You have not met the requirements for taking this exam.",
   "n-characters-left": "{{n}} characters left",
   "n-characters-over-limit": "{{n}} characters over the limit",
   "no-comments-yet": "No comments yet",
@@ -172,7 +174,6 @@
   "waiting-for-peer-reviews-explanation": "Other students are peer reviewing your answer. Please come back later to see the results.",
   "write-your-feedback-here": "Write your feedback here",
   "written-feedback": "Written feedback",
-  "you-are-not-eligible-for-taking-this-exam": "The exam is not open yet. Use this button to access the exam once the exam starts.",
   "you-have-completed-the-course-to-receive-certificate-use-following-links": "You have successfully completed the course! You can use the following links to generate your certificate.",
   "you-have-completed-the-course-to-receive-credits-or-certificate-use-following-links": "You have successfully completed the course! To receive ECTS credits for your completions, you can use the following links to register your completion and receive a certificate.",
   "youve-made-changes": "You've made changes",
diff --git a/shared-module/src/locales/fi/course-material.json b/shared-module/src/locales/fi/course-material.json
index 5d6cf5be8463..326f726f6180 100644
--- a/shared-module/src/locales/fi/course-material.json
+++ b/shared-module/src/locales/fi/course-material.json
@@ -99,6 +99,8 @@
   "max-points": "Maksimipisteet",
   "max-score-n-marks": "Maksimi pisteet: <2>{{marks}}</2>",
   "message-already-on-different-language-version": "Olet tekemässä kurssia jo toisella kielellä. Ennen kuin vastaat mihinkään tehtävään, palaa kieliversioon <1>{{name}}</1> tai vaihda käytössä oleva kieli kurssin asetuksista.",
+  "message-the-exam-has-not-started-yet": "Et voi vielä aloittaa koetta. Ole hyvä ja palaa myöhemmin.",
+  "message-you-have-not-met-the-requirements-for-taking-this-exam": "Et ole täyttänyt esivaatimuksia tämän kokeen suorittamiseen.",
   "n-characters-left": "{{n}} merkkiä jäljellä",
   "n-characters-over-limit": "{{n}} Merkkiä yli rajan",
   "no-comments-yet": "Ei kommentteja vielä",
@@ -167,7 +169,6 @@
   "waiting-for-peer-reviews-explanation": "Kurssin muut opiskelijat ovat vertaisarvioimassa vastaustasi. Tule takaisin myöhemmin nähdäksesi tulokset.",
   "write-your-feedback-here": "Kirjoita palaute tähän",
   "written-feedback": "Kirjallinen palaute",
-  "you-are-not-eligible-for-taking-this-exam": "Et ole täyttänyt esivaatimuksia tämän kokeen suorittamiseen.",
   "you-have-completed-the-course-to-receive-certificate-use-following-links": "Olet suorittanut kurssin onnistuneesti! Voit käyttää oheisia linkkejä sertifikaatin luomiseen.",
   "you-have-completed-the-course-to-receive-credits-or-certificate-use-following-links": "Olet suorittanut kurssin onnistuneesti! Voit käyttää oheisia linkkejä opintopisteiden saamiseksi tai sertifikaatin luomiseen.",
   "youve-made-changes": "Olet tehnyt muutoksia",
diff --git a/system-tests/src/__screenshots__/exams/exam-with-automatic-eligibility.spec.ts/cant-take-exam-before-meeting-exercise-requirements-desktop-regular.png b/system-tests/src/__screenshots__/exams/exam-with-automatic-eligibility.spec.ts/cant-take-exam-before-meeting-exercise-requirements-desktop-regular.png
index 72bd4a5f6b5f..e5fd6afdc39f 100644
Binary files a/system-tests/src/__screenshots__/exams/exam-with-automatic-eligibility.spec.ts/cant-take-exam-before-meeting-exercise-requirements-desktop-regular.png and b/system-tests/src/__screenshots__/exams/exam-with-automatic-eligibility.spec.ts/cant-take-exam-before-meeting-exercise-requirements-desktop-regular.png differ
diff --git a/system-tests/src/__screenshots__/exams/exam-with-automatic-eligibility.spec.ts/cant-take-exam-before-meeting-exercise-requirements-mobile-tall.png b/system-tests/src/__screenshots__/exams/exam-with-automatic-eligibility.spec.ts/cant-take-exam-before-meeting-exercise-requirements-mobile-tall.png
index f34da7ac2d6a..67814816324c 100644
Binary files a/system-tests/src/__screenshots__/exams/exam-with-automatic-eligibility.spec.ts/cant-take-exam-before-meeting-exercise-requirements-mobile-tall.png and b/system-tests/src/__screenshots__/exams/exam-with-automatic-eligibility.spec.ts/cant-take-exam-before-meeting-exercise-requirements-mobile-tall.png differ
diff --git a/system-tests/src/tests/exams/exam-with-automatic-eligibility.spec.ts b/system-tests/src/tests/exams/exam-with-automatic-eligibility.spec.ts
index 8c8966afb10c..8e7f771bfc8f 100644
--- a/system-tests/src/tests/exams/exam-with-automatic-eligibility.spec.ts
+++ b/system-tests/src/tests/exams/exam-with-automatic-eligibility.spec.ts
@@ -19,9 +19,7 @@ test("Can take exam after enough course points", async ({ page, headless }, test
       page.locator("text=Automatic course exam"),
       page.locator("text=Submissions are no longer accepted after"),
       page.locator("text=You have 1 minutes to complete the exam after starting"),
-      page.locator(
-        "text=The exam is not open yet. Use this button to access the exam once the exam starts.",
-      ),
+      page.getByText("You have not met the requirements for taking this exam."),
     ],
   })