I'd have to disagree. When I was in high school, I took an AP Euro class, the teacher was infamous for being a hard-ass and a relentless taskmaster, and I mean within the first two weeks of his class half the students dropped it because they knew their GPA would tank if they didn't give this class everything they got. The teacher himself was absolutely no-nonsense, if your chapter reviews were a day late, 25% penalty, no points for anything later, his classes were straight sit-down, get lectured, leave, any interruptions, immediate ejection. Most college courses I've taken afterwards don't even come close to how militant this guy, but I'll also tell you what, when AP exams came around the class was entirely 4s and 5s(I got a 5 myself). Discipline and organization yield results, so long as you're willing to put in the effort.