Update app.py

app.py

@@ -729,7 +729,25 @@ def create_quiz_interface():
                 f"Question {new_idx + 1} of {len(questions)}",
                 gr.update(visible=True)
             ]
+        def handle_prev(current_idx, questions, answers, current_answer):
+            return navigate(-1, current_idx, questions, answers, current_answer)
 
+        def handle_next(current_idx, questions, answers, current_answer):
+            return navigate(1, current_idx, questions, answers, current_answer)
+
+        def update_answer_state(answer, idx, current_answers):
+            new_answers = list(current_answers)
+            if 0 <= idx < len(new_answers):
+                new_answers[idx] = answer
+            return new_answers
+
+        def reset_quiz(text, num_questions):
+            """Handle quiz reset"""
+            return on_generate_questions(text, num_questions)
+
+        def view_certificate():
+            """Navigate to certificate tab"""
+            return gr.Tabs(selected=2)
 
         def on_submit(questions, answers, current_idx, current_answer):
             """Handle quiz submission with proper HTML rendering"""