Updates

app.py

@@ -23,6 +23,10 @@ if 'pdf_data' not in st.session_state:
     st.session_state.pdf_data = None
 if 'next_disabled' not in st.session_state:
     st.session_state.next_disabled = True
+if 'submit_disabled' not in st.session_state:
+    st.session_state.submit_disabled = True
+if 'selected_answer' not in st.session_state:
+    st.session_state.selected_answer = None
 
 def reset_pdf_cache():
     st.session_state.pdf_data = None
@@ -110,6 +114,7 @@ def navigate_question(direction):
         st.session_state.questions.append(new_question)
         st.session_state.current_index = len(st.session_state.questions) - 1
         st.session_state.next_disabled = True
+        st.session_state.submit_disabled = True
         st.session_state.selected_answer = None
 
 # Load all modules dynamically
@@ -132,6 +137,7 @@ if selected_module != st.session_state.current_module:
     st.session_state.module_question_count[selected_module] = 0
     st.session_state.module_correct_count[selected_module] = 0
     st.session_state.next_disabled = True
+    st.session_state.submit_disabled = True
     st.session_state.selected_answer = None
 
 # Load the current module's question
@@ -167,12 +173,16 @@ with st.form(key=f'question_form_{st.session_state.current_index}'):
     selected_answer = st.radio(
         "Choose an answer:", 
         options=current_question['options'], 
-        key=f"question_{st.session_state.current_index}_options"
+        key=f"question_{st.session_state.current_index}_options",
+        index=None  # Ensure no option is pre-selected
     )
     # Enable submit button when an answer is selected
-    submit_button = st.form_submit_button(label="Submit", disabled=selected_answer is None)
+    submit_button = st.form_submit_button(label="Submit", disabled=st.session_state.submit_disabled)
 
 # Handle button state and answer submission
+if selected_answer and st.session_state.submit_disabled:
+    st.session_state.submit_disabled = False
+
 if submit_button and selected_answer:
     # Process the answer
     current_question['selected'] = selected_answer
@@ -184,6 +194,7 @@ if submit_button and selected_answer:
         st.session_state.module_correct_count[selected_module] += 1
 
     st.session_state.next_disabled = False
+    st.session_state.submit_disabled = True
 
 # Show correct/incorrect feedback after submission
 if current_question.get('answered', False):