>>9312920it's gonna be pretty fucking difficult since you won't have a teacher to guide you through this shit anymore, and since you've neglected it for so long you've likely lost whatever skills you learned in your most recent math class anyway
you're going to probably need to relearn algebra to some extent. i'd get the book Algebra by Gelfrand, then I'd get trigonometry also by Gelfrand (unless you end up not liking Gelfrands style, in that case there's many more trig/precalc books out there), then you'll need to learn calculus. if you're in comp sci and business you'll need some level of calculus, but it doesn't have to be 100% rigorous, as there's just no point for that. stewart's calculus 7th edition is pretty good and it's about as rigorous as you'll need. pretty sure this covers vector calculus as well, which is what you usually hear called multivariable calculus or calc III.
differential equations could be useful but it's unlikely.
if you plan on doing a lot more in compsci you'll want to learn linear algebra. almost any acclaimed book is fine (axlers linear algebra is what i learned from), but you should get a book on proofs (how to prove it by velleman is a good book on that) before doing linear algebra.
this isn't going to be something that you'll get done in just a few months, this might take you a full year or longer depending on how long you spend per day on it
that might sound intimidating but when you first crack open that book and work on the first few exercises and immediately blank, just know that's supposed to happen and that this won't be a chapter per day sort of thing. this will likely be a section per week and a half (on average) sort of thing, so don't freak out when you can't read it and immediately understand it