If you invest, it is mainly probability theory and statistics. Because most of them are discrete data, the requirements for calculus are not high, but it is best to understand them.

I think this book is relatively introductory.

Comparing the introductory English version only requires a little mathematical foundation.

In the future, you can go to some venture capital companies or fund companies, mutual funds and hedge funds, which have higher investment requirements. I'm not sure what it is. In fact, investment is also of great guiding significance to personal investment. Buy stocks or bonds? Short term or long term? How to combine to minimize the maximum risk of profits and recover them in a short time? This is all about investment. I like learning about investment very much, because it is a rational and intelligent subject based on mathematics and quantitative probability. Wish you success!