Why do you have to cram students into a class when there are transfer students in the school? Take this class every time? Why? senior high school

It is normal for students to change classes. Every school has different rules. Some schools draw lots to decide, while others decide according to students' grades. If the students are in the same class every time, it may be that the class is special, or that the students are United, friendly and helpful, which is a good learning atmosphere for the students.