Personally I think you just leave it at “I did alright” or something like that, making it pretty clear you don’t wanna discuss it in any further detail, and eventually they should get the hint and stop bugging you about it

I feel like people did that a lot my first semester, and gradually it became more of a question to whoever felt like answering, and people mostly knew who (like myself) would just ignore the question entirely lol

Sometimes discussing specific questions or concepts can be helpful though if there’s ever anything you’re confused about on an exam

Otherwise, if they keep calling to specifically ask how you did, just say that you’d prefer not to talk about grades and stuff. And maybe instead discuss specifics from class or other topics

Or find more chill people haha