Let's be specific. First of all, we should pay attention to preview. Many people emphasize review, but I prefer preview. Because preview is a process of autonomous learning, and it is a process of really exercising "learning ability". In math preview, it is suggested that you should study as much as possible if you exceed the standard of 1-2 class hours, instead of just reading books, you should do exercises in the book to test the learning effect after reading. In the words of our math teacher, the first study is the most important. Some students put their first study in class, but the response is slow. As a result, they always can't keep up with the teacher's ideas, and the more they learn, the less confident they are. So I think it's better to take the initiative in your own hands, learn by yourself first, and then listen to the teacher. Pay attention, be sure to learn as much as possible. If you can't, don't mark it directly. Listen to the teacher. You must think about it first, and really don't give it to the teacher.
The class is also very important, but if it is prepared before, the content of the class will not be too difficult. Classroom also pays attention to initiative. The "initiative" here refers to actively thinking about the leading questions put forward by the teacher, the solutions of examples, and even the teaching ideas of the teacher. When you have your own understanding of the content of this class (referring to preview before class), you might as well think about it. If I were a teacher, what would I say? What are the key points? What are the difficult and error-prone points?
After-class review exercises are not good, so I dare not say more. I just suggest strengthening exercise. There are not many questions to be done, but you must understand what you have done. You can't make mistakes (not memorizing solutions, but really understanding the solution). Don't be too busy building the wrong problem book. To be honest, it takes a lot of time. The key is that you really know how to think about this kind of problem and how to start when you see it.
In fact, there is a very important objective factor in learning mathematics well, that is, the teaching level of teachers. If your teacher's thinking in class is not clear (knowledge points first, then examples), and he only thinks of what to say, without emphasizing the key points and mistakes, it is suggested to buy a good reference book (such as "top students' learning plan", or use "Longmen Project" if it is missing, or ask the students around him what to use).
Finally, a few words of nonsense. Learning mathematics really needs ingenuity. You can buy a puzzle book to exercise your brain. Play games when you have nothing to do, not reasoning, but Sudoku. While exercising the clarity of thinking, you can exercise your sense of numbers.
I hope it helps you.