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Khan Academy

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Get your free world-class education here! Browse Khan Academy's extensive video library and learn all about math, science, finance and history.

With over 2,800 videos and 300 practice exercises, you can boost your grades or simply learn about the subjects that interest you.

The Math section covers developmental math, pre-algebra, algebra, geometry, trigonometry, probability, statistics, calculus and more.

The Science section includes biology, chemistry, organic chemistry, healthcare and medicine, physics, cosmology and astronomy, and computer science.

In the Humanities & Other section, you'll learn about history, art history and American civics. You'll also discover various financial topics from banking and money to capital markets and the credit crisis.