A wise man once said "Those who do not learn from history are doomed to repeat it."
We go to school to learn many things, more important things maybe than actual material. We learn social skills, we make friends, imagine for one second that you've never been to school in your life, you would have no friends and your social skills would be down the shitter. We learn these things young, we learn how to talk to people, we learn how to work with people. I'M SURE you're thinking "dude I'd make so many friends on the hill", but in reality you'd be too shy and too stupid to go up to somebody and introduce yourself. Also, thanks to school I've personally met 8 great friends who are a hell of a bunch of guys to get fucking shitfaced with, and I've also met plenty of young tang.