I also review all by myself, and usually only learn double integral. I think the first time is the most painful, so I must stick to it. Of course, if you really can't understand the review materials, you must read the textbooks carefully. Don't be afraid to delay the time. The first time is the most painful and time-consuming. After the first time, you may not be able to do the review materials. This is a strong internal destruction process. It will take a day or even a day to read a chapter or even a question, but I must stick to it.

It's June 6th, so it's better to do exercises after reading the textbook Advanced Mathematics in 30 days. I don't think it's importune. After reading the line generation and probability for 30 days, I feel that it is not importune for the first time. So it's August 6th, and then I started reading review books. At this time, I may not know anything. I was in this state at that time and went home for a few days. When I started school, I found that I knew nothing. After I persisted, the second time I focused on the conceptual exercises I didn't know, and I only repeated the exercises I knew. I didn't read the whole book, and then the real question. Pay attention to summing up the characteristics of real questions in recent years, and some things are basically not tested.