If you feel like you might be a bit behind on your education or you need a refresh of some subjects, you might be interested in the Khan Academy.
You can learn about maths, art, computer programming, biology, finance, medicine, history and more.
Khan Academy is an organization on a mission. We’re a not-for-profit with the goal of changing education for the better by providing a free world-class education for 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. Khan Academy’s materials and resources are available to you completely free of charge.
I haven’t actually had a chance to do any of the courses yet, but they looks really good and the reviews of the site are extremely positive.