At present, freshmen are all college graduates, and the basic courses of science and engineering are similar to those of mathematics department, such as mathematical analysis, advanced algebra, college physics, analytic geometry, mathematical analysis principles, general physics experiments and so on. And general education and ideological and political education. If you want to save money, go directly to your brothers and sisters, or go to a second-hand bookstore to buy books about advice and politics, but don't buy them yourself. It's a pure waste of money.