Hey, I am an undergrad planning on grad school for statistics next fall. I have the summer and next semester to take some courses. I would like to take some math that interests me but I also would like to do something that will be useful to graduate school. I have pretty much taken minimal math to get go to grad school. Here is what I've taken. Calculus 1,2,3 , Linear Algebra, A basic set theory class that is an intro to proofs, Linear Algebra, and now I am taking Advanced Calculus. Next semester I have the option to maybe take a class about machine learning or I can maybe take topology if I can get into a class, what is useful for statistics?? PDE's? More Linear Algebra?