I hear this argument everytime someone questions the value of school, and it is not well thought out.
The human mind is designed to learn. You learn to walk, learn to speak a language, learn to eat, learn to swim, to reason, all well before you ever to to school so that they can "teach you to learn". Sure you learn SOME valuable things in school in 12 years, but how much of the important stuff could you really not have figured out on your own?
I learn so much more outside the classroom, I feel like I am wasting my time when I am sitting inside one, or memorizing various trivial facts for a test that the teacher makes no real attempt to apply to real life situation that I should be involved in in any way.