Middle school students: The middle questions in the textbook are classic, with fewer basic questions and slightly increased difficulty, which is suitable for middle school students.

Students who are preparing for high marks: The method of quick grading in the middle of the textbook will talk about many methods and ideas for solving problems, as well as error-prone points. Its topic part is more innovative, and the special volume inside has error-prone topics, which is very suitable for students who want to get high marks to learn error-prone questions.