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, "At 40 years old and after 22 years in retail management, I decided it was time to go back to school and do something that mattered. First step was taking the college placement tests but after 22 years with no math to speak of, I needed some serious help. I spent about 50 hours watching videos before I felt I was ready to go take the test. I am happy to say I scored perfect on the math test (even pointed out their test had an error which they had never noticed). Because of Khan Academy, I am now on my way to a new career. I can't possibly thank Khan Academy enough."
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