You may want to check out http://www.khanacademy.org/
I've used it to brush up on my Math skills, and found it to be pretty helpful.
"A free world-class education for anyone anywhere. The Khan Academy is a not-for-profit with the goal of changing education for the better by providing a free world-class education to anyone anywhere. All of the site's resources are available to anyone. It doesn't matter if you are a student, teacher, home-schooler, principal, adult returning to the classroom after 20 years, or a friendly alien just trying to get a leg up in earthly biology. The Khan Academy's materials and resources are available to you completely free of charge."