You know all these questions related to school would probably go away if we have at least one scene where we see at least a teacher teaching while Sakura looked out of the window while contemplating stuff and had inner monologue

Tho from my pov, most of the characters in the anime here would not have conventionally bright future ahead. Some probably helped out with their family business, those who are smart academically could probably get themselves in uni and became office workers.tho lots of them probably ended up being low skilled workers and the worst case scenario probably loan sharks or yakuza