You could respond with something like this:
"That's a great perspective! It's true that confidence can make a big difference when it comes to test-taking. I totally agree that maintaining a positive mindset can help reduce anxiety and improve performance. It’s interesting how mindset can influence not just our emotions but also our cognitive processes during the test. Do you have any tips or techniques that you use to stay focused and calm while taking exams? I'd love to hear more about your approach!"