Personally, I majored in economics and mathematics. In fact, from a professional point of view, some basic theories of economics are closely related to mathematics. Therefore, it is necessary for you to learn mathematical analysis well, whether for the cultivation of economics or mathematical thinking. But one thing you may not know is that the commonly used mathematical analysis contents in economics mainly include Lagrange multiplier method, derivative of multivariate function, extreme value of multivariate function, and others are formulas and theorems of linear algebra by rote. It is not difficult for ordinary high school students to learn from scratch, but the application of these knowledge by economics majors focuses on calculation and does not require strict thinking on mathematical theory. Simply put, as long as you took derivatives in high school, you can do it. Of course, if you have requirements for scholarships abroad, you should learn all the subjects well for the sake of credits. You should know that college courses can be learned by heart. Although it is difficult to say college mathematics knowledge, the requirements for exams are still very low. A lot of knowledge can be worked out as long as the concept is clearly grasped, unlike high school, which has strict requirements for calculation and proof. And by the way, many lecturers who teach economics are not very good at math, so they are not better than you, so you must believe that you can learn well.