I feel really guilty because I can't really remember any class in yr12 where I actually did any substantial work (and that means more than 3 spesh/methods/chem/physics(lol) questions in a period of class).
We pretty much talked, bludged, played games on phones/computer (CS or starcraft - I preferred CS personally) and did barely any work in class.
Class activities (not joking - and most of the class did this btw and we were the strongest class too!):
Methods - listen to our teacher rant against the music dep (including a memorable plan about destroying it and replacing it with cricket nets), about football, about how all sports are crap compared to cricket, teaching us useless words like "vinculum" with the sole purpose of wasting our brain cells and rants against various staff members
Chem - watching youtube videos with the teacher, burning magnesium, playing real-life CS with pipettes and distilled water, excessively buring matches (and their boxes), doing the Age puzzle page with the teacher. We could also ask for help, she was a very good teacher in that way, great explanations that turned into constructive class discussions!
Spesh - we actually listened to this guy because he was awesome at teaching, then when his teaching was over, we just did whatever (usually the age puzzles, general chat or phone/ipod games)
English - listened to the teacher (who was pretty awesome and super nice!) and then played games on the computers on surfing youtube
Physics - the ultimate joke class. No-one payed ANY attention. CS and random shit (planking, throwing stuff at people or into the bin from various locations, piling up chairs and tables, even walking out was alright). Best troll class for the worst teacher and subject.
So yeah, feel really guilty looking at the hate in this thread

More or less depending what kind of school you go to and the quality of the teachers.
Oh LOL, quality of the school has NOTHING to do with it (see above)
I also feel kinda bad for wasting 90% of my class time in MHS and how that effected my results, but that's a different issue, school was sooooooo fun!