okay so i hated high school a lot, but did pretty well. here's how i got through it if anybody needs ideas:
school is really useful as a place to learn. it puts you in a mostly quiet, distraction-free environment for six hours a day, five days a week. however, it also tries to trick you into giving up this incredible opportunity by making you go to class and do set exercises
i started skipping class in my senior year. i missed maybe 2/5 to 1/2 of my lessons, and in most of the ones i attended, i didn't really do the set work. i didn't take a single note the whole year. i stopped going to japanese and drama entirely, choosing to focus on the three subjects i was sitting scholarship exams for: english, media studies and art history.
however, all this skipping didn't mean i wasn't studying. skipping a class didn't mean heading to burger king or getting high behind the bike sheds or whatever my friends were doing. i would find somewhere quiet and isolated, where i wouldn't be bothered by friends or the administration, and read. instead of wasting time goofing around in a class of thirty kids, with moronic teachers struggling to keep everyone focused on simple and unnecessary exercises, i was able to get in an hour of intensive, involved study for every lesson i missed. time in class is so often time spent distracted, chatting, doing pointless shit - you almost owe yourself truancy
the main benefit was that i was able to design my own curriculum, which meant i could put a heavy focus on literature, the visual arts, film, greek and roman myth/society, history, as well as gain a rudimentary knowledge of things that my high school didn't offer, like theology and philosophy. and i could study all of these in far more depth than the curriculum covered - i know americans have a better system in terms of english, but in new zealand, at the high school i went to, we covered one book in class per year. that's about 200 hours spent studying, in my case, 1984, a novel that can be read and understood in a couple of days. i was able to read and study about forty classic novels in my final year, mostly through not paying attention in class and just doing my own thing in the back. don't be fooled into thinking that school can teach you better than you can teach yourself - you don't have to be a genius to improve on the curriculum, you just have to be dedicated to actually learning.
as far as in-class learning goes, lessons that are mostly raw knowledge are well worth paying attention to. information is information, no matter where it's coming from. it's when they bust out the worksheets that you step quietly aside to continue doing something useful, i.e. absorbing further information by reading. personally i never found revision helpful at all - breadth of knowledge was more important than details, so i covered new material instead of going over what i had already learnt. but that's not necessarily for everyone.
your teachers aren't going to appreciate your behaviour, and they will become frustrated. remember that this would usually be justified, and they are right to do somehting about it. but do stand your ground. for the first few months, expect a battle. eventually they will grow to respect you and leave you alone once your grades start showing that your approach is working. by halfway through my senior year, my teachers had pretty much given me a free pass in terms of work - as long as i kept getting perfect marks they didn't care how i spent my time.
that said, don't dismiss your teachers. most of them will be stunning mediocrities but there are always a few golden exceptions somewhere in the school - the people that are in teaching for the love of their subject and the love of education. this kind of teacher is extremely helpful both in extending your understanding (no matter how smart you are, you aren't going to have the same breadth of knowledge as an intelligent, university-educated adult. they will see things you don't) and in lifting your morale.
the second point is important, because this kind of lifestyle isn't fun. you will find yourself becoming lonely and depressed, and this will worsen the further away from your peers you get in terms of knowledge and thinking. you won't have anyone with which you can discuss what you're learning about. the happiness you get from knowledge and learning is valid, but it isn't the same as the happiness you get out of a close friendship, and by extending yourself intellectually you will, sadly, distance a part of yourself from the rest of the student body. even if somebody is taking the same approach as you, it's unlikely they'll be studying in the same direction.
my solution to this was, kind of embarrassingly, alcohol. social drinking temporarily eliminates the higher concerns that otherwise won't leave you alone, and it allows you to interact on an even footing with your peers. going out and making a fool of yourself with your mates is a great antidote to the pretension that you risk by immersing yourself in academia - and it helps to remind you that even if people aren't doing the same thing as you intellectually, they can still be lots of fun and very much worth getting to know. go to parties, hang out with people, have a social life. otherwise you will go completely insane
anyway, i know this advice certainly isn't conventional, and some of the stuff sounds like a bad idea. if it's going to get you into trouble, don't follow it - the stress will just distract you from learning, and learning is your main objective. also important: remember that this lifestyle isn't about being superior to other people, however tempting that view seems at times. it's about being proactive about changing a system that wants you to waste half your life. there are other ways to live life, and they are just as valid. so don't dismiss people on the grounds that they aren't on your level academically.
ANYWAY JUST TO PROVE THIS ISN'T THE WORST POSSIBLE APPROACH TO SCHOOL, WHICH ADMITTEDLY IS WHAT IT SOUNDS LIKE:
i was valedictorian at my graduation, i graduated top of my school's year for english and media studies, top ten in the country for art history, passed the two subjects i had skipped with decidedly average marks, and ended up with more scholarship money than i can actually spend on university tuition. this kind of learning can work, and when it does, it pays off. but you have to work damn hard at it.