Junior high school math, the results are not bad. In high school, I have a new math teacher. There are some previews in the summer vacation, so I know all the knowledge points, concepts and formulas in the textbook, but I haven't done any questions in the summer vacation. So when the new high started, it was still relatively smooth. Later, it gradually became possible that sometimes one or two points were ideological accidents, and sometimes there were differences in classified discussions. This is my general contradiction. The math teacher is not good at math, that is to say, he will only list the things in the textbook, and will not give you a deeper understanding at all. When he finishes, he will start practicing. When practicing, he will let you copy the questions first (the questions you find yourself) and then say them directly, without giving you time to think. When you speak, you basically copy the steps, and occasionally read the answers twice where you need to pay attention. There is no technical content at all.