[numix]

I took a course for the A test material, and read a book in a couple of hours covering the AB test material, letting me skip two semesters of CS courses in college. This allowed me to have plenty of free time in school to work on interesting stuff.

The material on the A test seems to be mostly programming in Java, and you'll probably pick up the other skills from working in any language. The AB test gives a good foundation for CS, which isn't always applicable in day-to-day programming, but certainly helps in shaping the way you go about solving a problem.