In terms of difficulty, counting one is the most difficult and counting four is the easiest.

Mathematics 1 includes: high numbers, linear algebra, probability theory and mathematical statistics.

Mathematics II includes high numbers and linear algebra, and mathematics III includes calculus, linear algebra, probability theory and mathematical statistics.

Mathematics 4 includes calculus, linear algebra and probability theory, among which science and engineering are the best, and economics is the third.

If your major is optics, metallurgy, transportation, biomedical engineering, etc.;

Then you should choose math one. These majors have higher requirements for mathematics, and they need to prepare for review in advance to pass the exam more easily. Therefore, only by choosing the right type of mathematics can they cope with the exam more easily.

If you major in agriculture and forestry engineering, forestry engineering or food engineering, then you should choose Math II. The test difficulty of Math II is not as big as that of Math. Candidates of these majors should remember not to choose Math I, and don't make the postgraduate entrance examination more difficult because of the wrong choice.