Have you also considered looking into other schooling options if the school won't accommodate him?
You may need to consider having alternate plans if this does not work out. We are already on our plan B after we slammed into the wall at age 3 with a preschool that is run a lot like most traditional schools are run - when DS told us he was bored and hated going in (and was starting to mess around with other kids behind the teacher's back - never a good sign), and we had to look at alternate options for his pre-k onwards.
