Advanced mathematics is divided into: mathematical analysis (calculus, real number theory, etc. ), linear algebra, advanced algebra, probability theory, etc.

Advanced mathematics really needs some knowledge of high school mathematics. I suggest you teach yourself high school mathematics first. It shouldn't be too difficult for a junior high school math student. You can study advanced mathematics after you finish high school mathematics, but you need to read many books instead of one. I suggest you go to the book building and other places to find some books that you are satisfied with. If you have time to read it patiently, there should be no problem.

Hope to adopt, thank you!