Mathematics is a complete knowledge system from junior high school to university, and the simple part is in junior high school and senior high school. Only from the analysis of knowledge system, functions (including trigonometric functions), series, analytic geometry and solid geometry are relatively complete knowledge in senior high school. These contents have not been greatly expanded in universities, and the backbone contents have been learned in high schools, which is one of the reasons why the college entrance examination is the key examination content. In the university, the expansion of this part is actually the deepening of the content. For example, high school function, college learned complex variable function, and solid geometry learned several new theorems. In this part, universities rely heavily on high schools.
If high school doesn't like it, I'm afraid it's difficult to go to college. I have a classmate in East China University of Science and Technology. She was good at math in high school. College is a headache for advanced mathematics. I don't understand at all.
Do you mean this scientific mathematics as a math major or just as a math subject? Mathematics is only a part of the economy, but a solid foundation will make you feel at home in learning the economy.
It is not easy to learn mathematics well in postgraduate entrance examination, but it is easy to take the financial major. Postgraduate finance requires not only mathematics, but also English and politics.
If you are a graduate student in finance, why don't you study undergraduate in finance? You don't have to learn mathematics well to enter finance. Finance includes not only mathematics, but also a lot of theoretical knowledge.
Finance major should not need too complicated mathematics. You can post it and have a look.