What’s a “lower school?” A lower ranked school? Which ranking? For what major? Rankings are a game that can be manipulated by the colleges.
IMO, there are many many excellent schools in the US that will be happy to have your son, where he will get an great eduction and be prepared for whatever comes next.
FWIW, I think exploring areas of interest and focusing on what he likes is a great approach in HS and probably helped him figure out what he liked and what he didn’t.
Sounds like your school has a different approach with the “bundles”. That will be in their school report that will accompany your child’s transcript. I’d have a sit down with the guidance office and see if they consider your son having had the 4 years of history. Sounds to me like he does.