You should decide what type of programming you want to focus in first. And then you decide what kind of math you want to learn/improve. I've mainly programmed business applications and I've yet to use much more than basic Algebra. But if I decided to program core physics libraries then I would need a higher level of math competency.

As a student in school I was told that I would need lots of math if I wanted to be a developer but that has not been the case and I feel that all my math training was good for me as a person but it has not added to my career as a business programmer to a great degree.