Mathematics-linear algebra, advanced mathematics, probability theory and mathematical statistics all need to be tested, which is relatively comprehensive and difficult, with linear algebra accounting for 22%, probability theory and mathematical statistics accounting for 22% and advanced mathematics accounting for 56% at most. In the 123 middle school, the scope of investigation is the widest, and basically the whole textbook has to be tested. It is called the most difficult of the three numbers. The examination content of Math II is only linear algebra and advanced mathematics, of which linear algebra accounts for 22% and advanced mathematics accounts for 78%. The range of linear algebra in Mathematics II and III is roughly the same, while in advanced mathematics, Mathematics II has been deleted a lot, such as vector algebra and spatial analytic geometry, triple integral, curve integral, surface integral and infinite series, which are not tested, so it can only be called the simplest of the three numbers without reviewing this aspect. The proportion of examination contents in Math III is the same as that in Math I, which also requires linear algebra, advanced mathematics, probability theory and mathematical statistics, among which linear algebra accounts for 22%, probability theory and mathematical statistics for 22% and advanced mathematics for 56%. However, compared with the first one, the third one does not investigate vector space, analytic geometry, triple integral, curve integral and surface integral, and all applications related to physics are not investigated, while calculus is more investigated. Compared with the number one, there is no hypothesis test and confidence interval in probability statistics.