My recommendation is to try to network through the grapevine and find out whether or not there are other students who've been allowed to subject accelerate in math. What you need to find is one example of "it's been done" and then go back with a written request to your ds' school stating every test results and written recommendation you have.
You might also check your State laws and school or district policies to see whether they may mention gifted services, especially identification, placement, pacing and/or acceleration.
