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I literally did NOTHING this past year and managed mostly A's with a few B's, and I took Calculus and Physics! :P
Granted, Physics was easy since we didn't really do anything but once in awhile. The teacher had the college prof philosophy: You guys are old enough and responsible enough. I'm not really gonna teach you unless you ask for help, and I expect you to know the material for test days. I got pretty good at Dino Run and Robot Magical Unicorn Attacks! in that class, though.... My skill has probably gotten crappy again, though. Haven't played in a few months.