From the first year of high school, systematically review the mathematics knowledge of high school, don't miss any questions, and try to understand them all. At this time, don't ask for sea training. Get to know it first. Just like taking a new lesson, increase the amount of training in the second round of review, find the weak points and focus on tackling key problems. In the third round, return to the basics, practice a lot of basic problems and occasionally practice some difficult problems.

The wrong problem set is a good choice. You can do less if you are good at math. If your grades are average, I suggest you do it seriously. However, it is not necessary to write down all the wrong questions, classify them first and then copy them. Don't write down the answer process right away. Set aside some space first, write the answer in pencil nearby, and do it after a while (maybe a week). If you can do it, you have understood it. If you can't do it, you can.