You will be required to take Calculus 1 and 2, at a minimum. Some schools will also require Stats (algebra- or calculus-based) and/or Linear Algebra. Depending on where you specialize, you may need additional math courses in the upper-level division.
You’ll also need Discrete Math. That deals with logic and proofs. You’ll cover topics like set theory, number theory and combinatorics. Most people find it more challenging than computational math like Calculus, because you’re required to reason your way to a solution.