The difficulty level distribution is moderate, the introductory and basic articles are completed with the course in the basic stage, and the intensive articles are completed in the intensive stage.

Many students can do it 1800 just by watching the basic courses in Tang Jiafeng. The content of 30 classes is more than the basic courses in Tang Jiafeng, and more people can achieve 1800 in 30 classes. However, it should be considered that students with poor foundation have much lower desire to speak in Zhihu. Anyone who is better than you in Zhihu does not mean that you are weak.

Students of Math II have more time to review. If you have more mechanical mathematics, I suggest you do both the high numbers 1800 and 1000. At this time last year, I was as confused as you about which to choose.

19 A senior monk told me not to choose either book, but to do both, which suddenly woke me up. As for linear algebra, 1800 is enough, and the line generation part of 1000 is not very good. If 1800 is not enough, you can certainly do the linear algebra part of 660, and the topic is quite good.