Hello, I am a student who took part in the postgraduate entrance examination this year. My math score 127 can be regarded as your senior. According to my experience, I can tell you directly that the exercises in the postgraduate entrance examination textbook must be done, and must be done more than twice, depending on your own mastery. You should also try to do it because most of the textbooks are mainly simple questions, and many of them are real questions for the 90-year postgraduate entrance examination. It is very difficult and comprehensive, so it is very difficult for students who are new to mathematics to do it. Therefore, it is very important for the author to make an asterisk. It is a process of improving ability. I hope everyone will pay attention! Math III is the same as Math I, but the difficulty is slightly lower, but you should also pay attention to the fact that math accounts for a large proportion in the postgraduate entrance examination. There is basically no hope for failing in math and professional courses!