Khan Academy has over 3,300 videos covering K-12 math, science topics such as biology, chemistry, and physics, and even finance and history. .
Khan Academy's mission is to provide free, world-class education to anyone, anywhere. With thousands of videos and step-by-step problems, their online materials cover subjects ranging from math and finance to history and art.
One user says, "I spent the first 15 years of my life failing school. When I was 14, I started failing pretty badly and fell into a world of drug addiction. The final exam of high school that determines if you go to University or not was coming, and I had no idea what to do. I first met the Khan Academy in 2007. With 5 years of work to catch up on and only Khan Academy helping me, it was a grueling experience. Thanks to Salman Khan, he has allowed a drug addict whom the public would look down upon to persevere and come out on the other side with a result good enough to get into Western Australia's best University."
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