They use a lot of recent PTs (I mean 60s, 70s and 80s) for their problem sets. So if you're trying to save these PTs, I'll say stay away from Khan. When I first started studying a few months ago, I started with Khan (did not know any better), I kind of regret it a bit.
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I have used the Math part a couple of years ago and had a pretty good experience. It was really helpful and handy. Also the topics are well organized.
They use a lot of recent PTs (I mean 60s, 70s and 80s) for their problem sets. So if you're trying to save these PTs, I'll say stay away from Khan. When I first started studying a few months ago, I started with Khan (did not know any better), I kind of regret it a bit.