Mathematics is a very interesting subject when taking the postgraduate entrance examination. It's good that you didn't give up. In fact, to be honest, reviewing the questions in the whole book is not that difficult. I haven't done 660 questions, and I don't know how difficult it is. Actually, I think all you have to do is chew the whole book. Reading review books is not just reading, but getting questions. Think about what to do first. I really can't read the answer. After reading the answer, I want to sum it up. This is very important. Summarize the classification of which knowledge point this question corresponds to, and then try to extend it to other aspects of this knowledge point. This is really important. Do more questions, you can learn more, you can distinguish the questions, and you can know where the test center is. Summarizing means doing more and summarizing more. If time is limited, I think summing up is more important. In addition, I also have a headache when reviewing triple integral, but one day I will suddenly have an epiphany, so don't worry. In addition, if you really can't do it, give up the triple integral. I mean, put the triple integral at the end.

I wish you success in the postgraduate entrance examination! Postgraduate entrance examination is really tiring, so you must stick to it! ! Start (a disease)