Most people refer to advanced mathematics, but in fact, in my opinion, any subject in college is not as "difficult" as high school. You know that reading textbooks is not enough for high school courses, but a certain course in a university needs breadth, not depth, and its depth is extended by the next course related to it, which means that you can read the textbooks of a certain course three or four times, which is basically the same. If you understand all the exercises after class, it means that you are qualified and can get a good grade. University courses can only understand basic concepts and basic theories.

2. For some specialized courses, we should turn our vision to the cultivation of practical ability. Even if you want to take the postgraduate entrance examination, you need to wait until the end of your junior year.

Since you are a college student, you should use less reference materials and read more textbooks. Because what you need to learn is likely to have no reference materials at work, the ability of self-study needs to be cultivated in the university.

4. relax! You won't be so depressed when you get used to college life for a while.