algebra 1 in middle school...i never studied for tests and placed very high (highest i ever got was a 99% for a 2nd place out of 110 or so, then i kinda stopped doing homework and dropped to a 96 which is what i believe i finished with), i couldn't beat #1 who had a 102%, the guy went on to go to a top school in so cal (i think its a magnate school, im not sure, he's placing #1 there is what i heard from some people that talk to him) and he's won national contests i think -.-
american history in middle school, science in middle school, our teacher sucked and never taught us anything
i think a course's difficulty is dependent on the teacher, rather than the class