Disclaimer: DS is pre-school and I don't know anyone with school-age children so my knowledge of secondary schools ends in 1988.
Reading MN, I have been struck by how many things children DON'T do in school any more: separate sciences, multiple languages, sport etc.
I went to school in the 80s and did English (lang+lit), French, Latin, Geography, History, Math, Chemistry, Biology, Physics and at last 4-5 hours of sport and PE every week, all within the normal school day.
So if children in secondary school aren't doing all these things, what are they doing instead?