I suggest Wu Zhongxiang run through this chapter, because he is better than Zhang and Tang, but the old lessons can be used as a supplement to solve the extreme value of conditions.

2. Differential equation

The first is the soup stock, which is very delicate. It belongs to the kind that feeds you the knowledge points.

3. Double integral and triple integral

Listen to Wu Zhongxiang or Zhang Yu in this part. Tang was a little confused when he talked about triple integral, which was not as thorough as the above two.

4. Series

Zhang Yu was the first to be promoted, mainly because you can have a basic understanding of series. Establishing series is to study infinite terms, and an is actually an infinitesimal quantity. And Zhang Yu's concept is thoroughly explained, which allows you to build a solid foundation. However, Zhang Yu's class has a characteristic: even if you understand it, you can't start with the problem, but it doesn't matter. It is enough for the basic class to understand the concept thoroughly, because watching the intensive class is the time to really enlighten you.

5. Analytic Geometry+Curves and Surfaces

These two parts are some special meetings. I suggested talking to Mr. Wu Zhongxiang, but he spoke in a hurry, so we can combine Mr. Xu Xiaozhan's courses as a supplement. The two are basically invincible.

6. No.3 synthesis

Tang's grasp of economic problems is still not enough. Although Wu Zhongxiang's explanation is good, but there is no interest rate problem, you can borrow Wu Zhongxiang's class and then come down to supplement it yourself.

The above is the relevant sharing about preparing for the exam. I hope it will help everyone. If you want to know more, please pay attention to this platform in time!