Ahh But you see, Not everybody comes from a clan, (and that would mean nobody but clans can become ninja) Nor should Ninja's who have a job to do, have to do that and teach their childish every little thing... Sorry but you're missing the point. This is for the benefit of all, though there are those that fall beneath cracks.
As for the Western Schools? Huh? This is a Japanese Manga with Japanese school structure most likely... Nothing to do with Western.