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I suggest to at least stay to do the quiz (every class, except when new material is started). If you spend a bit of time doing the perusall so you can get your points, it will boast your grade for all of the quizzes by a lot. Instead of doing the Lon-Capas, I think you should focus more on the problem sets. Questions are taken verbatim from the problem sets... The videos and power points he posts are not worth the time to go over them.