1, different grades, 2a school is generally one university, and 2b school is two universities.

2. The affiliated institutions are different. 2a schools are directly under the Ministry of Education, while 2b schools are mostly under the Ministry of Education.

3. Different treatment opportunities. 2a schools have great competitive advantages and good teachers, while 2b schools have little competitive advantages and teachers.

The score of 4.2a is 530, and the score of 2b is 480.