Engineering Mathematics "Linear Algebra" was published by Machinery Industry Press.

Probability theory and mathematical statistics of Zhejiang University

These are three authoritative textbooks, mainly for science and engineering. Choose a "review book" by Li Yongle and practice it again and again. I found that Li Yongle's books, especially "400 Questions" and "Sprint135" (published in10), all have original titles and similar types; I read Chen Wendeng's book earlier, so I regret it. This is a mess, and there is a gap between problems, not as close as Li Yongle's book.

Self-study is no problem, but it's best to sign up for a math graduate class now, and now I'm in a basic class, which is good for Li Yongle and garbage in Chen Wendeng. After signing up for Mr. Chen, I can take notes every day.