fix(api): exam logic yet to be fixed

app/exam/[id]/page.tsx

@@ -16,7 +16,7 @@ export default function ExamPage() {
   const test_id = searchParams.get("test_id") || "";
   const type = searchParams.get("type") || "";
 
-  const { isOpen, close, open } = useModal();
+  // const { isOpen, close, open } = useModal();
   const { timeRemaining, setInitialTime, stopTimer } = useTimer();
   const { test, answers, startExam, setAnswer, submitExam, cancelExam } =
     useExam();
@@ -36,7 +36,7 @@ export default function ExamPage() {
     if (window.confirm("Are you sure you want to quit the exam?")) {
       stopTimer();
       cancelExam();
-      router.push("/unit");
+      router.push(`/categories/${type}s`);
     }
   }, [stopTimer, cancelExam, router]);
 
@@ -142,12 +142,6 @@ export default function ExamPage() {
             >
               Submit
             </button>
-            <button
-              onClick={showExitDialog}
-              className="flex-1 bg-gray-200 text-gray-900 p-6 font-bold text-lg hover:bg-gray-300 transition-colors"
-            >
-              Cancel
-            </button>
           </div>
         </div>
       </BackgroundWrapper>