One has to wonder how valuable the teaching actually is. For example you didn't get it and never learned, while the GP had it and picked it up naturally afterward. I wonder if we do in fact subconsciously pick up *something* useful from the teaching in high school, even if it doesn't seem the case. I too similarly learnt via high school first then picked up the rest myself. I guess we'd probably need more than anecdotal evidence to find this out though.