GUIDE TO ONLINE LEARNING: http://www.accreditedschoolsonline.org/online-schools-guidebook/

Click links to free online tutoring below:

Khan Academy http://www.khanacademy.org
This library of videos covers K-12 math, science topics such as biology, chemistry, and physics, and even reaches into the humanities with playlists on finance and history. Each video is a digestible chunk, approximately 10 minutes long, and especially purposed for viewing on the computer.