Update app.py

app.py

@@ -666,7 +666,7 @@ def create_quiz_interface():
                     questions,
                     0,
                     initial_answers,
-                    gr.update(selected=tab_index),
+                    gr.Tabs(selected=tab_index),
                     gr.update(visible=False),
                     gr.update(visible=False)
                 ]
@@ -674,11 +674,11 @@ def create_quiz_interface():
     
             def goto_take_assessment():
                 """Navigate to Take Assessment tab"""
-                return gr.update(selected=1)
+                return gr.Tabs(selected=1)
     
             def goto_certificate():
                 """Navigate to Get Certified tab"""
-                return gr.update(selected=2)
+                return gr.Tabs(selected=2)
     
 
             # Fix View Certificate navigation