If you don't take the postgraduate entrance examination, it depends mainly on your own situation, whether you can solve problems by yourself through video materials, and whether you can have self-control and independent learning ability.
As far as high numbers are concerned, there is no doubt that Wendeng Chen said it best; Zhang Yu's method of solving problems is worth seeing, especially Taylor's formula; Li Yongle mainly talks about line generation, and the high number part of the book is compiled by Li Zhengyuan, and Li Zhengyuan talks about it comprehensively, but compared with Wendeng Chen, it is not systematic enough, and the methods are mostly routine.
If you have time, you can listen to these teachers' classes first and see whose style is more suitable.
Extended data:
Test paper structure
Multiple choice questions: 8 questions (4 points for each question);
Fill in the blanks: 6 questions (4 points for each question);
Solution: 9 questions (each question is about 10);
Full score 150, and the test time is 3 hours.
2. Examination subjects and scores
Advanced mathematics: 84 points, accounting for 56%(4 multiple-choice questions, 4 fill-in-the-blank questions and 5 big questions);
Linear algebra: 33 points, accounting for 22%(2 multiple-choice questions, 1 fill-in-the-blank questions, 2 big questions);
Probability theory and mathematical statistics: 33 points, accounting for 22%(2 multiple-choice questions, 1 fill-in-the-blank questions, 2 big questions).
Note: Probability theory and mathematical statistics are not tested in Math II, and the scores and questions of this subject are all added to higher mathematics.
3. Examination characteristics
① Total score 150, which accounts for a large proportion in public courses. The national average score is around 70, and the score line gap is large;
Pay attention to the foundation, according to the examination outline, examine the formula theorem and fix the knowledge points;
③ Pay attention to high-quality test center training and summary of questions.
Reference link: Baidu Encyclopedia Postgraduate Mathematics