It's been a while since I've used algebra and trigonometry, and I suspect I would need to re-do most of these classes, but I imagine it should be easier than the first time.
I just completed my associate's of science degree in computer science at a community college at twenty-three-years old (I spent five years going to community colleges after high school graduation - mostly just taking exhausting all the courses that seemed interesting) and now I'm transferring to a university this fall to complete my bachelor's of science. Unfortunately, my grade point average isn't too hot so I'll mostly likely attend a state school, i.e. San Francisco State University - I hope the job opportunities in that regard will still be wide.
P.S. I took discrete mathematics (it's called discrete structures where I took it) a few years ago and it was interesting and fun, despite doing poorly on counting/probability. This textbook covers most of what you will learn in that course: http://www.cs.yale.edu/homes/aspnes/classes/202/notes.pdf