I suggest you use the college entrance examination help for mathematics. In senior high school mathematics, you need to know what knowledge points are required by the syllabus and how much they account for in the senior high school entrance examination. You can take a look at the section of "Exam Syllabus on Test Sites" of the College Entrance Examination Help, and then carefully sort out the knowledge points of test sites. At the same time, you should be able to do examples in the right column to help you understand. The most important thing in mathematics is understanding. ...