Thank you for the helpful links, everyone. I've also found some PDFs that various professors put online, detailing the prerequisite knowledge for precalc/calc, with some sample problems. Those will be my goal, and so I think I'm set on learning materials for mathematics. Again, thanks so much!
I'm also looking for something similar on the prerequisite knowledge for a university freshman biology or chemistry class. Does anyone have a good idea about where my knowledge in these subjects should be at before I attempt the class? This site that Klaynos linked is pretty good (http://www.bbc.co.uk/schools/websites/16/site/science.shtml) If I know the biology/chemistry/physics information in that link, will I be ready to begin college coursework in biology/chemistry? The science videos on Khan academy and academic earth (which are great websites, btw) seem geared toward a college student to begin with. I just want to make sure I have the prerequisite knowledge down first, thanks.