Good resource list at the end of this article for people who want to become better at math/coding:

Resources to Help Boost Confidence in Math:

Forget what you learned in school (memorizing theorems or trig identities won’t help you). Instead, learn to recognize problems and choose the right formula.

Read great books (Links to free versions in the article)

      Art of Problem Solving

      Mathematics for Computer Science (free eBook)

      Godel Escher Bach (free eBook)