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Algebra, Geometry, and Trigonometry will be your new best friends. You must know how to calculate a multitude of things (e.g., altitude, range, glide angle, etc.) if a main system goes down, and you're left having to bring an aircraft in the old-fashioned way.
You should get a hold of a practice ASTB (Aviation Selection Test Battery) which the Navy uses both for OCS and Aviator candidate selection in addition to the ASVAB. There are quite a few problems/questions in there that pertain to ATC, and the math/equations you'll need to use to solve them are typical of what ATC's use.
Go the recruiter, take a practice asvab. they can tell you what you need work on and you will have a better idea since you took a "practice" test.
get a tutor if needed. your real asvab score will determine your whole career.
ps. im pretty sure you do not need to be a genius for that position, i was in the service and I think you will be fine, just follow m y orders private. you will succeed.