Difficulty gradient distribution is moderate, the basic stage followed the course to do the introductory and basic chapter, the intensive stage to do the intensive chapter.

Only watch the Tang Jiafeng basic class can do 1800 students in the Zhihu are a lot of people, 30 lectures content than the Tang Jiafeng basic class more, can use 30 lectures to get 1800 basic will be more. But we have to consider the poor foundation of the students in Zhihu's desire to speak out is much lower, in Zhihu randomly who are stronger than you do not mean that you are weak.

Math 2 students, review time is more abundant. If you have the spare capacity for your own high math requirements, I recommend 1800 and 1000 of the high number of parts to do, last year at this time I was also full of doubt as you in the end which one to choose.

A very high math teacher in 19 years told me to do both don't pick, all do, a hit to wake me up. As for linear algebra, doing 1800 is enough, the 1000 linear algebra section is not very good. If 1800 is not enough to do of course you can also do a 660 linear algebra part, the topic is quite good.