Postgraduate entrance examination mathematics is divided into three books, one of the best, mainly depending on what major you take. Generally, the number of science and engineering subjects seems to be more than one, two and two. There are three economic subjects, mainly depending on the professional examination requirements of your school. The number one and three books mainly talk about high numbers, line generation and probability theory, while the number two books only talk about high numbers and line generation. When reviewing, just look at the basic knowledge in the textbook, carefully study the real questions over the years, and you can dabble in simulation questions when you have time. Basically, there is nothing wrong with the exam. At the same time, there is an examination outline every year, which lists the knowledge points and the degree to be mastered in detail.