School was fairly useless...They didn't even teach us about periods until we were 14, by which time loads of us had already started!
Sex education in schools is an absolute disgrace. It's totally inadequate as is frequently demonstrated on here by people asking if they can get pregnant while they're on their period etc...They don't tell you nearly enough about contraception and the different methods you can use, they don't tell you enough about STI's and how they're spread. They seem to assume as well that you won't get pregnant, or you won't catch anything, so they don't really offer any advice on what to do if it does happen.
I could rant on for ages...