Algebra II is probably necessary (you at-least need to be very comfortable with the concept of variables). Stats couldn't hurt. Any math class that teaches you

Algebra II is probably necessary (you at-least need to be very comfortable with the concept of variables). Stats couldn't hurt. Any math class that teaches you proofs will be helpful when you stat tackling BDD/TDD. But overall, I'd say that taking a formal logic class (usually part of the Philosophy Dept at most colleges), will be the most bang-for-your-buck.