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, "As a previous university dropout returning to university, who had not done any maths or physics in the past 8 years, I had some serious catching up to do. I had even forgotten how to add fractions. Khan Academy has truly been instrumental in my success. This time round I wanted to develop an intuitive grasp of everything, it wasn't good enough just to know a formula. Khan Academy's approach to learning was exactly what I was looking for. The net result was 9 A's for the year and 2 B's. Learning is now a pleasure, and I am confident I will repeat my academic success this year."
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