Understand the after-class exercises of each unit, and you can basically get 70 ~ 90 points in the college entrance examination. Don't ignore after-class exercises just because they are simple. 70% of the questions in the college entrance examination are of medium and low difficulty. When you understand the exercises after class, you should focus on the function part, which has been the focus for years! The space geometry part will be less than 20 questions, and the probability type will generally not exceed two questions. The focus is on function! ! ! If the foundation is not very good, don't compete with the problem. After the exercise is finished, do the simulation first and then do the real problem, focusing on what type of problem it is. Math problems are basically a soup, and changing numbers is a new problem.