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alanog comments on How many of you doing Khan Academy? - Less Wrong
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I don't use it systematically anymore, but it's my first port of call when I don't understand something in school or want to hear something explained differently. It works pretty well when I use it in this way, although he often goes through things more slowly than would be ideal for revision purposes.
So, you just use the videos and not the exercise?
Well, there are no physics or chemistry exercies, and the linear algebra ones weren't around when I needed them. The calculus problems were useful though.