Summarize the knowledge points learned since the beginning of school, do a few more examples in unfamiliar places, and then find some exercises to do. The formula must be memorized, so don't get confused. Basic knowledge should be solid and never divorced from your original religion. The easiest way is to do all the examples in the book by yourself, don't read the book, and then check it against the book to find out your own shortcomings. Mathematics is to do more problems and remember more formulas. Practice makes perfect. I hope it will help you and get good grades.