Motivation
Calculus for computers? :huh:
Yes, oh Great Gauss yes! It has to do with the motivation for making these computer thingies in the first place. Calculus is (these days) taught through limits, which is how to add up an infinite number of infinitely tiny things to get a useful number. Approximating that gets very tiring for a human. Liebniz, the co-inventor of calculus, spent some time at least dreaming of a machine to relieve mathematicians of this laborious figuring. As recently as WW 2, a "computer" was someone like Françoise Ulam, crunching numbers for her husband at Los Alamos.
Calculus will get you the mathematical constant "e." Your floating-point units are built around this constant and pi. Those are the only two far-out-n-funky numbers in all of computer mathematics. Trig is done by raising e to imaginary powers. Your school certainly does not want to graduate someone who doesn't know this, and it sounds like they'd rather not teach you so they make it a requirement (the ways of schools are a mystery to me and I tend to giggle during the chanting^H lectures anyway).
Places like iTunes University and MIT's Open CourseWare are great. Wikipedia is of course good for a quick consult, examples, proofs. Wolfram Mathworld is excellent and is perhaps "too good" because I get distracted by the fascinating clicky-links!
You'll learn to get to e by taking a limit of the compound interest equation (I learned that at a young age from a side-note in a 1970s T.I. programmable calculator manual, forever cementing in my mind the usefulness of computers to explore mathematics). You'll learn about Madhava-Taylor series to get there too.
When you "get it," you'll be having fun.
Hail probe!
On a slightly different subject, I agree that "pre-Calculus" is useless. Dive in! Drink deep! There is one thing more useless, and that is "pre-Algebra." Do these schools teach swimming with a whole year of wading?