Get in touch with it in advance. Go and buy a textbook. That book is really good, and all the main points are in it. The exercises are also classic and difficult. The most important thing is that there are key points everywhere, and there is no nonsense. From compulsory to compulsory four, compulsory three is not recommended, and the contents are all statistics, so there is nothing to learn. Elective courses should pay attention to whether to study literature or science in the future. It is best to wait until you are admitted to high school and get used to it for a while. However, before going to high school, we should learn junior high school mathematics well, which is the foundation. However, high school knowledge is not closely related to junior high school, which is not very helpful to junior high school.