I don't know which celebrity said that fear comes from uncertainty about things. I think your fear is caused by the uncertainty of the result after you go up, which is normal, so you will worry about whether you will lose face. When I was studying, the teacher asked my classmates to answer questions or go up to do problems. People who knew how to do it always raised their hands and rushed up.

So if you want not to be afraid, you must be good at this. If your math is not very good, you must try to make up for it. In high school, we should also learn to teach ourselves and preview in advance. At that time, what the teacher didn't say, I had learned eight or nine points. If the teacher said it again, it would be considered as a review, so the learning effect was very good and the natural results were also very good. So you should master the learning methods and improve your ability. Like homework in many books, you don't need to do it step by step like a textbook. As long as you look at the topic and think clearly in your mind, you can read more and accumulate more.

In fact, if you really can't answer, it's not a shame. No one can know everything. Instead, you can comfort yourself with a smile. I will do it next time.