Maybe not necessarily taught, but constantly brought up by teachers. "College is going to be much harder than this!" Individual classes and concepts, sure, but the amount of time spent doing work is substantially less. let's do some math real quick. Alot of high schools do 7 class periods a day 5 days a week. That's a 40 credit hour work week (not counting time spent outside class working on homeworks and projects) as opposed to 12 hour weeks being considered "full time" in college. Even if you put the "study 2 hours outside of class for every hour in class" principle in college, that would still amount to 36 hours a week. Still less than you are forced to do in high school.