School is 80% useful in my books, because you can do whatever you want with the stuff you learn at school, some of it, however, (language arts namely) is competley useless. So that knocks off 20% for me.
Okay, to certain people (aspiring writers) language arts is useful, and I am pretty creative, but it comes easy for me (I have Apsegers, I think differently from ost people) so Language Arts is a pain in the a** for me.