I don't like college, because I MUST sit in on lectures that ever hardly teach me anything. I learn almost exclusively from reading the book, deriving questions from reading the book, then asking the professor after class those questions. I just don't understand how anyone expects a 1 hour shallow discussion on a topic will help anyone much. The book is far more detailed.
Some will say 'taking classes they don't enjoy' in college, but that is minimal since most classes you have to take (even unrelated to your major) are mature, necessary, and interesting.
And of course, I hate having to wake up, losing sleep and the will to study.
As for HS:
It had the same sleep problem except HS was early as hell no matter what (no schedule control), so it was even worse. It also taught me nothing (except I had to be in lectures for even longer than in college AND the material was BORING and BASIC unlike college). Here, unlike college, I found the 'taking classes I don't like' problem to actually exist. Wellness? Gym? Music? These were things that just didn't interest me yet wasted all of my time.
But on top of the lectures not teaching me anything, the book almost taught me nothing too. HS needs to be harder and shorter.
I feel like college is a bit too slow also to accommodate the horde (for many classes). I swear, many classes are a bunch of boring, useless lectures then a couple days of studying before the test. I could have finished those courses in 2 weeks with an A (e.g. my tech elective engineering economics (ie405) or introduction to programming c++ or our logic course with FPGA boards etc.)