Generally speaking, 1A, 2A, 3A, 1B, 2B, 3B refer to the grades of universities, and 1 refers to key universities approved by the Ministry of Education, which is commonly referred to as schools; 2 means non-key universities, which are usually called undergraduate universities, which are usually called two schools; 3 represents three colleges and universities; And a and b refer to the grades of similar schools.

For example, 1A stands for the best school in a school (that is, the best school in a key university, such as Tsinghua, Peking University and Renmin University).

2A refers to the better school of the two schools.

1B refers to a school that is one grade lower than the first-class school, but definitely better than the two schools, such as University of Mining and Technology and University of Petroleum.