Upstairs is bullshit. The Chinese Academy of Sciences has a graduate school, and all the graduate students in the school are concentrated in Beijing Graduate School in the first year. The teachers here are absolutely first-class, of course, the problem is not the problem.

Because the Graduate School of Chinese Academy of Sciences has not been approved by the Ministry of Education before, it can't grant degrees. An affiliated school of the Chinese Academy of Sciences is China University of Science and Technology, so the Graduate School of the Chinese Academy of Sciences used to be labeled as the Graduate School of China University of Science and Technology, but it has nothing to do with China University of Science and Technology, so the test paper is called Mathematics A and B for the Graduate Examination of China University of Science and Technology.

Later, the Graduate School of China Academy of Sciences was awarded the right to confer degrees. The brand of the Graduate School was changed to the Graduate School of the Chinese Academy of Sciences, and the names of mathematics papers were also changed to Mathematics A and B.

Let's talk about the difference between math A, B and national papers. Mathematics A and B only take the advanced number part, and the national paper takes several advanced numbers, probabilities and line generations. The Chinese Academy of Sciences has done several math tests, and they have done well, so the questions are very level and seemingly simple, but in fact they are very difficult. I suggest you review according to the high part of math 1, and you will get good grades if you work hard.