Mathematics is a basic subject. Unlike liberal arts courses such as Chinese, you must do more exercises. Of course, don't engage in sea tactics, which will confuse you. Do some targeted questions to ensure that the selected questions are typical and can play a multiplier role. When you finish a question, you should not only ignore it, but also "think after the question", whether you did it yourself or not, and know the answer through explanation. Be sure to think again after you finish. How did you do that? Would you do it if you encountered a similar problem? In order to play the role of giving inferences. It can be said that learning mathematics is more about thinking than doing. But don't get me wrong. To learn mathematics well, you still have to do thousands of problems, even as many as 10 thousand. Do not believe that you will know after reading the third year of high school. In addition, it is quite correct to prepare a notebook, write down the wrong questions every time and have a look before the exam. As long as you can use the above scheme when doing the problem, I believe your grades will be improved.