What is the course used for? Don't pupils have to follow the course?

The curriculum is used to arrange time. For example, what time to take classes this Monday morning. When do you have classes in the morning? What classes do you have? How many classes? The same is true in the afternoon. Primary school students are also students, so they must attend classes, which not only ensures the study time, but also has a break, and teachers and students have a rest in class.