What does Class ab of Yanshan University mean?

Here's the thing. After entering the school, the school will organize another English test and computer test, and then according to this score, the top students will enter Class A and the top students will enter Class B. In fact, there is no difference between Class A and Class B. The teacher draws lots to decide which class to teach, so there is no difference in the teacher qualifications between Class A and Class B. The difference between them is that Class A is progressing very fast and not very detailed, but when Band 4 and 6 are completed ahead of schedule, teachers can arrange some punching classes to practice real questions before the exam. Class B speaks very seriously, step by step, and the teacher even analyzes grammar for you, which is actually quite good and responsible. Regardless of Class A and Class B, the key is to rely on yourself. Class A also has Level 4, and Class B also has experts.