In high school I took Calc AB, Calc AB, Multi-Variable Calc, and Ordinary Differential Equations. I only needed Calc AB for college, which means I have (had) a bunch of useless math knowledge.

Some of it could be interesting, but absolutely useless for a student of the arts, and particularly useless for someone who never took physics and had no desire to ever take physics (even though I ended up taking Physics for BA students this semester, which had no math). I'm now two full years out of taking any math class, and I can happily say that I remember next to none of it. The only things I remember are differentiating basic functions and integrating basic functions. Considering there was a time where I could do a dilac delta function, that's a looooot of stuff that I don't remember, at all.