some of the accomadations could be giving him extended time, chunks of assignments, letting him keyboard, scribing, orally answer,
My son's speecl/language person also gave my son the "Comprehensive Assessmet of Spoken Language" test. It was very informative in identifing if his difficulty in writing was due to not knowing how to form the ideas or physical difficulty. This test is not given often, but due to my son being HG/tourettes she did. It really gave me some great info.