You might want to check your scores, as some of the numbers don't match up:
132 is the 98th %ile
131 is the 98th %ile
The remaining WISC and WIAT standard scores match their percentiles.
The GAI (derived from only VCI and PRI) may also be a better representation of your son's cognition, especially given the extreme relative weakness in PSI; I expect it would fall in the low-to-mid 130s. Did the psych compute that for you? Oh, and with that PSI score, the PRI may be somewhat of an underestimate, as one of the required subtests is timed. Actually, one of the WMI subtests is timed, too.
To my knowledge, none of the major group standardized tests of the SAT/ACT/PSAT/PACT variety allow completely untimed testing. Usually, one must request +50% time or +100% time. It is possible that this applies to the SCAT as well.
In any case, his SCAT math score appears in line with his WIAT math score (which is completely untimed), so he may not have lost as much as you fear from the SCAT.
I don't know whether a reasonable portfolio for DYS can be assembled from your son's data, not having attempted to do so, but I will note that most of his scores are a standard deviation or more away from the DYS minimum--not an insubstantial difference, which suggests that it would be a bit of an uphill climb. Other than the slow processing speed (for which, if you have not already done so, you may wish to request a 504, most likely under the neurological classification, in Massachusetts--I assume you have, since he had accommodations for the SCAT), your son actually has quite a nice profile for excelling in school within the range of services usually available in high-performing districts, especially once he reaches the secondary level, when honors/pre-IB/IB/pre-AP/AP classes start to become available.
Is he unhappy at school? What specific concerns do you have about his educational needs/services?
