Most of the teachers, the staffing, the classes I have, the work, the homework, the absence of a good music or art class, my peers, the fact half of us have to share lockers, the lines in the cafeteria, the cafeteria itself, the smell in the cafeteria, the food in the cafeteria, the smell in the bathrooms, the food in the bathrooms, how cleanly everything is(n't), having to wear a uniform, seeing commercials for (back to) school clothing when every school I've ever been to requires khakis and polos, seeing every tv show ever on tv that has kids in school without a uniform, the books I have to carry, having to use a backpack, having to change before PE starts, PE class, the locker room, Axe, people who smoke, the cheer leader's uniforms, the fact I'm stuck in this shithole of a school because I was rejected from another school I wanted to enter because I'm not a racial minority, the fact they only get 1-ply toilet paper, the fact no one uses a toilet nowadays and does their business on the walls or the trash can or the floor, the fact I'm apparently the only one who's read a book in it's entirety in my class other than the teacher, the poor selection of books in the library, the fact I haven't had a field trip since middle school, no child left behind, school funding (or rather the lack of it), etc etc etc etc etc etc etc etc.
J/k. I don't go to school. But I've had every one of those problems at one point in time. Might as well put an option in the poll that says "Everything".