Never, never do anything crazy. Students who have played strategic confrontation games know that it is enough for junior soldiers to build a few. Only by saving money can they win later. Junior soldiers not only have low attack power, but also have no fun magic. The meaning of their existence is to make you have the ability to endure to the later stage. There are so many courses listed above. It takes you five years to finish six sets of Jiminovich's mathematical analysis exercises, and you will be 30 years old, and you haven't started the second-level course yet. So, just do some exercises after class to help you review, think, keep your brain running and keep learning in reverse. If you don't understand at all, come back and do exercises to help you clear your mind.

Understand ideas:

The essence of mathematics is not the number of problems, but the mastery of ideas. Every branch of mathematics has its own main ideas and methodology, and different branches also have their own ways of thinking for comparison and reference. Pay attention to it, imitate it, trivial knowledge will be strung into a necklace, and you will master a lesson. Ideas can't be easily understood by reading textbooks. You have to read several books to understand some applications.

Progressive circuitous learning, comparative learning:

Many times, I only read a book, probably because the author's thinking has jumped somewhere, and you can't keep up with it in the future. One trick of learning mathematics is that you can get several internationally famous textbooks at the same time and compare them with each other, or read another book on the same subject after reading one, so you can skip the familiar content. If you don't understand, stop thinking or doing exercises, or if you don't understand, take a step back and move forward from what you can understand. When you read more, you will find that something appears in many places, and your understanding of it will deepen.