Generally speaking, 1A, 2A, 3A, 1B, 2B, 3B refers to the achievements of universities, and 1 refers to the key universities approved by the Ministry of Education, which is commonly referred to as schools. 2 refers to non-key universities, generally refers to undergraduate universities, which are commonly referred to as two schools. 3 means three colleges and universities. A and B refer to the grades of similar schools, such as 65438+.