Advanced mathematics is mainly calculus, which is not taught as a key point in high school, but only derivative, so I learned calculus well and mastered it, and basically learned advanced mathematics.

Judging from the textbooks, advanced mathematics is more "professional". Many professional symbols and technical terms have never been seen in high school. Many things expressed in words in high school are symbols here. Except for the word "Xie", there may not be a Chinese character that can explain a problem. I'm sure I'm not used to it when I first came here, but I'll find it interesting when I get used to it.

Most people who just went to college find it difficult to learn advanced mathematics because it is not the same idea as high school. Many high school ideas can't get through here, but don't give up. This is a subject that must be faced. I can't do it without learning, but I can't.

As for the exercises, I can only say until you master them skillfully, because many differential and integral formulas and some formulas such as gradient and curvature have to be memorized, and no one told you during the exam. To master, people are different. Some people are fast, others are slow. It's up to you.