DLA claim for teenager - gone to tribunal

Complete nightmare trying to claim this. Got turned down as did the reconsideration. We've not gone to appeal.

That got adjourned today because they want to contact the school.

Problem is he needs PLENTY of support when hes home but he masks brilliantly at school. Hes a master at it (which I understand is common). The school have been useless in the past  and been oblivious to be honest. They're "feedback" was not helpful when we got the diagnosis.

So what are the rules exactly for any rate DLA? I've got a feeling their going to say "hes fine during the day in school so you can't have anything". 
Seems to preclude ANY  Aspie kid who attends a mainstream school and masks like this.