Personally, I think you'd better not use inscriptions, because learning mathematics is not about sea tactics. The key to learning mathematics is the cultivation of mathematical thinking. It's more about doing it yourself than watching it, because you know many mathematical problems, but when you do it yourself, you find that you can't do it at all, so I suggest you learn mathematics like this (purely personal point of view):

1) keep up with the teacher's rhythm and follow the teacher's ideas. Of course, it is best to surpass him, but as long as you fully understand what the teacher said, you have absorbed the essence of mathematics learning during this period.

2) It is not enough to keep up with the teacher's rhythm. You have to take time to do it yourself, so that you can really understand what the teacher said.

3) Always record your mistakes, which is where you can improve your score. As long as you can guarantee that you won't make mistakes in the problems you do, you will definitely get high marks in math (which can be done by excellent experts in general).

4) When approaching the exam, you should look at the textbooks and the error-prone topics you recorded, and understand your knowledge loopholes and error-prone places. In this way, I believe your math will definitely improve.