The books written by Huang Xiankai and Cao Xianbing are very good. I wrote this book last year. There are many methods in that book, which are relatively simple and detailed. Last year, I took Math 2 and got 125, which was not bad. Please read it carefully. After reading Huang Xiankai's book, I will do Li Yongle linear algebra, and then do the real problems over the years.