They recently told us DS is at the highest reading level they have books in the classroom. They don't have any other physical books to give him until he moves up to the next grade. It's immersion, so I think it's reasonable they won't have as big a pool of books to choose from... I'm wondering how insulting it would be to offer to just buy the next set? They're only $100 I think.

Anyway, if it's the highest group have you checked to see if they have the right resources to even give him if he moves higher?