My issue is that there simply aren't any practice exercises on linear algebra. I've attempted to watch the videos on this site, and even though they are more advanced than most stuff around here, I still grasp the concepts roughly. Now I'm doing linear algebra and I'm struggling hard. Just last year I was struggling with calculus before a big exam that might have seen me out of university early, but I watched these videos on Khan Academy and did the exercises and I passed (after maybe a week of thorough practice). I've been on Khan Academy for over 3 years now, and this site has saved my ass more than once.
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