Fan Casting High School in Sort by Tropes

In the US, high school is usually the last four years of compulsory education (grades 9-12), although in some districts it's the last three (grades 10-12). In Japan it's three years (equivalent to grades 10-12), and not compulsory. In both cases students are likely to be coming from a Junior High, which consists of grades 7-9 (although not all US districts have those). In Russia, it's called "middle" school, "high" being the university, and lasts through grades five to eleven, being kind of conjoined with Junior High. For Britain, see The Good Old British Comp (though that isn’t the only option for teen-school stories in Britain by any means).