I agree that we should ask for more testing time for him, but do they even consider that for someone who has average processing?
My dd12 got more time and her processing speed was pretty avg. Hers was in the 42 percentile which was something like a 97 on the PSI. Her other indeces, like your ds', were in the upper 90s, though, so it was a big difference.
I believe that her 504 was based on both the major discrepency btwn what she could do and how fast she could do it and that she had an OT diagnosis of SPD and dyspraxia. I'm actually not sure that I'd label her with either although she is overresponsive to noises and very cautious.
I would think that, with both the ADD diagnosis and the lower processing speed in relation to other skills, it would be entirely reasonable to get a 504 with extra time. The ADD alone should warrant that type of accommodation if it helps him perform more on par with his ability.
