For those wishing to beef up their skill and improve their performance at school. This site offers a free extensive video library, practice exercises, and assessments covering 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:

http://www.khanacademy.org/

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