Well, the goal of grading depends on whether it is a top-level key class or an ordinary class. The general principle is acceptable to most students. Of course, it depends on how tall they are. They should stick to the exam syllabus and talk a lot. In fact, the knowledge points of each level are similar, but the training questions of key classes are different from those of ordinary classes, and the depth of explanation is naturally different. Top classes and key classes talk more about mathematical thinking methods and laws, while ordinary classes emphasize basic training.