diff --git a/backend/${IMAGE_PATH}/5871dfad-83fc-4665-b2d6-5edeada95134_bono.jpg b/backend/${IMAGE_PATH}/5871dfad-83fc-4665-b2d6-5edeada95134_bono.jpg
deleted file mode 100644
index c936434..0000000
Binary files a/backend/${IMAGE_PATH}/5871dfad-83fc-4665-b2d6-5edeada95134_bono.jpg and /dev/null differ
diff --git a/backend/${IMAGE_PATH}/7da84650-3544-45e3-9677-f8187b8ceb34_bono.jpg b/backend/${IMAGE_PATH}/7da84650-3544-45e3-9677-f8187b8ceb34_bono.jpg
deleted file mode 100644
index c936434..0000000
Binary files a/backend/${IMAGE_PATH}/7da84650-3544-45e3-9677-f8187b8ceb34_bono.jpg and /dev/null differ
diff --git a/backend/src/main/java/com/edufocus/edufocus/quiz/controller/QuizController.java b/backend/src/main/java/com/edufocus/edufocus/quiz/controller/QuizController.java
index 49b009d..c95b595 100644
--- a/backend/src/main/java/com/edufocus/edufocus/quiz/controller/QuizController.java
+++ b/backend/src/main/java/com/edufocus/edufocus/quiz/controller/QuizController.java
@@ -73,6 +73,10 @@ public class QuizController {
             return new ResponseEntity<>(HttpStatus.UNAUTHORIZED);
         }
 
+        if (quizset.isTested()) {
+            return new ResponseEntity<>(HttpStatus.CONFLICT);
+        }
+
         quizSetService.updateQuizSet(quizSetUpdateRequest.getId(), quizSetUpdateRequest.getTitle());
 
         Map<Long, Boolean> quizUpdatedCheckMap = new HashMap<>();