C.B.
I think year round schooling is too new a concept here in the states to know if it's a success or not. My take on it is that if it's widespread and all the kids in school are doing the same thing, it works. One must remember that kids feel 'judged' by their peers and it might have a negative impact on kids. If the child sees kids that go to another school getting out in June, having fun, going on vacation, they may not put in an effort just to be able to do what those others are doing. See what I mean?
But if the child is exposed only to same school playmates, schoolmates, it'll be fine.
I would make sure a year round fits in with your family plans too. Planning a vacation? You have to work it in to year round.
You may want to consider mainstream school and add a tutoring program to it like Sylvan or one of the others.
You've got options. But good luck!