You must read the textbook carefully and recite the concepts and what the teacher added. Don't think that such scientific things as mathematics don't need to be memorized.
Then find a set of questions. You should hand out exercise books. Do it with examples from beginning to end, and then ask the teacher if there is anything wrong.
It is difficult to improve a set of problems and such a systematic project.
I took part in the college entrance examination twice, and the first year was 140. At the beginning, I was poor at math in high school, but as long as I persisted in such a systematic project, I finally made great progress. Mathematics in the second year of college entrance examination is very difficult. I misjudged a question and got 138. I think this method is very useful.