It sounds like this school is really a poor match for DS. I am with Kriston with so little time in school he is home so much that you can as well go for official homeschooling.

We did the other way around and do academics at home and he goes to a private school (mixed ages) for 2 afternoons to have fun - lunch, recess, music, crafts, ... No academics involved. That way he gets to play with other kids on regular basis, we get break from each other and I don't have to worry about academic mismatch.

LMom