kpow67,
I'm a 45 yr old AS, and your son sounds like a dead ringer of me when I was his age. Back then, no one would imagine there was anything wrong with me other than being lazy and defiant. In public schools there were really no special accommodations unless a child was "ret*d."
Let me guess, your son seems eager to begin a project or assignment, but then just seems to "spin his wheels" and not complete it? I think this partly may because I do not believe an AS can look at classes and assignments like regular people, as required tasks to be completed even though they may not be always interesting or stimulating. Much of life involves completing various steps to achieve long-term goals, but strange as it seems, that concept was very hard for me to grasp at that age. If it wasn't fun and stimulating, I wasn't motivated to do it. Hence I was lazy, even though I wasn't lazy at all when pursuing my own interests.
I hope you do find helpful accommodations for your son though I can't say for sure, even with hindsight, what those might be. In my case, I eventually figured out how to succeed in school and graduated college and then got a professional degree. As smart as some of us AS people seem to be, we learn very slow when it comes to social rules and conventions, though we do learn.
Cheers & good luck, JR