It really depends on what you want to do, and your general penchant for applying what you learn.
If you are going into Physics, Calculus, and almost all higher mathematics, is a must. From what I've seen, all the other sciences require less Math. Chemistry may benefit from an understanding of Group Theory, Fourier Analysis, and Linear Algebra (but mainly in Physical Chemistry).
All the sciences require an understanding of Statistics, if for no other reason but to keep up with scientific journal reading.
If you're going into any form of engineering (except maybe Computer/Software Engineering which will benefit a lot more from Discrete Math, Algorithm Analysis, Modern/Abstract Algebra, and Category Theory), a conceptual understanding of Calculus, Linear Algebra, statistics, and Fourier Analysis will likely be needed (Civil Engineering maybe another exception if you go into the more book-keeping or Project Management aspect of things where Statistical Analysis plays a much bigger role).
Finance requires some basic Calculus from what I've seen, but I've also seen extensive use of statistics and probability theory (which benifits greatly from Fourier Analysis) in Finance Journals .
Speaking more generally, you will need to be profficient in whatever language will be used in your daily activities. This usually doesn't mean an extensive load of courses in them, however. Proficiency in language comes mainly from use, and not coursework. Communications, Public Speaking, Buiseness writing, and Technical Writing, however, may be useful.
Being conversant in all the classic literature in Mandarin or English, I wager, has little practical value when compared to the mathematics or statistics courses I mentioned (again depending on the feild you choose). However, being learned in literature may make you a more well-rounded person.