1, major: Generally speaking, universities will be divided into classes according to major, and students of the same major will be assigned to the same class. In some schools, students of the same major may be divided into several classes to facilitate teaching and management.

2. Entrance examination results: At the time of admission, some schools will conduct entrance examinations and then divide students into classes according to their examination results. This kind of placement method usually divides students with similar grades into the same class for teaching and management.

3. Geographical factors: In addition, some schools will divide classes according to students' gender, age, region and other factors. For example, some schools will try to put students from the same area into the same class for management and communication.