Non-normal classes: in addition to language subjects, other subjects in universities should learn advanced mathematics, advanced algebra, probability theory and mathematical statistics, and science and engineering should learn general chemistry, college physics (this course is difficult and interesting), analog circuits, calculation methods and mathematical equations. These subjects all need a solid foundation in mathematics, but the subjects in the university are fleeting, and everything you learn in a semester will basically be used in the future.
The mathematics department of our university is divided into three majors: mathematics and applied mathematics, computer science and statistics. If you are not good at mathematics, coming to the department of mathematics is like going to hell, but if you are very good at it, it is much more interesting here: mathematical analysis, advanced algebra, spatial analytic geometry, ordinary differential equations, complex variable functions ... I like studying these subjects, which is very interesting. Of course, there are subjects I don't like, such as real variable function and functional, but it doesn't matter, the semester has passed.