Stats and linear algebra are what you want... On the linear algebra front, you get some understanding from your first course, but the more you internalize it b

Stats and linear algebra are what you want... On the linear algebra front, you get some understanding from your first course, but the more you internalize it by meeting the ideas in different contexts, the more useful it will be. A decent amount of higher math is turning things into almost-linear problems, and then trying to sort out the parts which don't quite fit...