In this way, I used to be asked to answer questions in almost every class by a super fierce math teacher, and I was often scolded for making mistakes. It doesn't matter if you get used to it after a few times. After all, I was called up because I was nervous or couldn't answer the question right away, and I didn't do it during the exam. What is there to worry about? Just learn my own.

If you are criticized in class for a while and can't change it, forget it. You have time to do other things.