No matter what difficulties you meet, you must overcome them. First of all, you should have your own reference materials (be sure to read them carefully, don't ask the teacher, don't look at others, remember that learning knowledge is above everything else. If you don't know the question, you should think it over before asking the teacher. After you understand them, you should also think about where you came up with it and didn't. More importantly, you should ask yourself why you can't think of them. You can find a suitable reason yourself, and you should know that you should not be stumped when you encounter such a problem.

Don't be discouraged after failing the exam. Failure is the mother of success. As long as you are diligent enough, you may be the first in the midterm. To be honest, this is my personal experience. Before the mid-term exam, it was 80 points every time. At the end of the exam, I got 130. I didn't seem to feel anyone around at that time.