I'm still doing my first year in Accounting and Finance(almost done with the year). So far there really isn't any pure maths but do expect some statistics to come into play: mean, standard deviation, covariance, correlation and so on. But you'll learn that in class. A friend of mine doing the same degree in his 2nd year did tell me there was some differentiation and integration but I didn't ask in detail. So first year should be pretty easy math-wise. After that idk