Update app.py

app.py

@@ -741,6 +741,12 @@ def create_quiz_interface():
             """Navigate to certificate tab"""
             return gr.update(selected=3)
 
+        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 on_submit(questions, answers, current_idx, current_answer):
             """Handle quiz submission with proper Markdown rendering"""
             final_answers = list(answers)