Does the report for the WISC that showed the low processing speed give any support for the idea that he might need extended time on tests? If so, you may be able to get testing accommodations based on the processing deficit, if the documentation is recent enough. If the problem is actually slow processing, then extended time may help.
Low processing speed scores can also be indicative of problems with tracking and convergence, visual processing, visual-motor integration, attention, or fine motor skills, all of which can affect performance on these kinds of assessments, and all of which typically respond well to the appropriate therapies. Have these sorts of problems been ruled out?
