Different schools have different curriculum arrangements. Freshman only studies high numbers and linear algebra, sophomore probability theory and complex variable functions. To learn this major well, we must learn advanced mathematics (especially calculus). Advanced mathematics is closely related to the professional courses we will learn in the future, and complex function is also very important. If you are bored now, you can look at Gao Shu. In fact, there is not much need to preview, as long as you study hard with the teacher after school starts, there will be no big problem. I wish you a full and happy college life!