Ask the teacher if you don't understand.

No, why, because, according to my own opinion, 10 students ask their teachers, among which 10 is a poor student. This is a rule, and it is also the experience of my brothers and sisters, so don't ask the teacher easily, don't continue to do it, if not, just read a book. It's not really a big deal. The key is the basic thing! If you keep asking questions, I'm afraid you can only rely on the teacher and have no real independent thinking.

Bottom line: Don't be afraid, there is still time, think independently, and don't do problems, because thinking is doing problems, and doing problems will only waste your time. Every time you encounter a problem, you should think about the thinking of the problem, then check the answer to see if it is the same, just think about what you didn't expect, how you came up with it, that is, you haven't mastered it yet, so don't learn it again.

Mathematics is something to think about, not a tool to do problems. As long as your ideas are consistent with your answers, you don't have to write them out. The most important thing is to grasp it!