The number one, two, three and four in mathematics for postgraduate entrance examination are decreasing in difficulty, and different majors take different mathematics tests. Generally speaking, the first is the electronic and computer examination of engineering, the second is chemical engineering, the third is the examination of economic management, and the fourth is the professional examination of management.

The range of number one is the most complete, and calculus, statistics, linear algebra and so on are all tested; The number two does not test statistics, and the number three and the number one are similar in content, but relatively simple; The content of the number four test will also be less, which is the simplest of several.

Now bookstores in various cities have reference books with many names, but the thicker the better, depending on which arrangement and explanation you like.