Li Er reviewed the whole book (at least twice, and the second time began to summarize).

Tutoring lectures on linear algebra (at least twice, it is better to cooperate with his line generation intensive class)

660 questions (all multiple-choice questions and fill-in-the-blank questions, and make a summary after finishing)

Li Yongle's real questions over the years (at least twice, the first simulation of the whole examination room, the real questions are always the focus)

400 questions (in fact, I feel that this book is not very good, and I feel a little scum after doing it, but it may be recommended online for my own reasons, and the subject can also buy it and have a look).

Five sets of questions from the University of Technology (I personally think that the simulation questions closest to the real questions are downloaded from the Internet as PDF, and the latest ones are available around11every year).