I majored in bioengineering. When I was a freshman, I took the first and second volumes of advanced mathematics (one book per semester). I studied linear algebra in the first half of my sophomore year and probability theory and statistics in the second half. I have no math in my junior and senior year. If you take the postgraduate entrance examination, you need to re-learn advanced mathematics and line generation at the beginning of the next semester (line generation will not be tested in the second year).