There is no shortcut to improve mathematics, only by constantly doing problems to consolidate the foundation and improve the speed of solving problems on this basis. If you can't do the problem, you must first think for yourself and try various methods to solve the problem. If not, you can look at the problem-solving ideas, then do it yourself, and then do a similar project to consolidate it. Nothing will happen when you are in a hurry, indicating that your mentality has not been adjusted well and your foundation is not firm. When you are training, you should take an exam and do it within a limited time, so that you will be much better during the exam.