Update app.py

app.py

@@ -796,7 +796,8 @@ def generate_question(subject, difficulty, question_type, subtopic=None, use_enh
         system_prompt = f"""You are a mathematics professor. 
         
 Part I. Write 10 {question_type} exam questions that can be solved analytically, without numerical methods,
-in increasing order of difficulty from easiest to hardest that would test a student's ability on the topic {selected_topic} in {subject}. 
+in increasing order of difficulty that rigorously test a student's mastery on the topic {selected_topic} in {subject}
+at the level that would be expected on a final exam at a top tier university (Stanford, Harvard, MIT, Caltech, Oxford, etc). 
 The easiest question should still require at least one step beyond direct formula recognitition. 
 The medium questions must require multiple techniques and require mastery of relevant mathematical concents.
 The hardest two questions must require advance techniques would be very tricky even for an undergraduate mathematics major at a top university, but still must be analytically solvable.