If you are an ordinary student when you are doing math, I suggest you skip the final question (including optional questions) and do what you can. If you want to further improve your math scores, you can sum up some methods and ask your classmates how to understand this problem.

Don't be afraid of math. In most areas, you can't do math problems. The purpose is to distinguish good students from bad students. Don't worry if you haven't finished them yet.

I wish you better and better in math!