You might want to wait until you have the WISC data, so the testing data is more concrete.
When my son scored exceptionally well on the Explore test, the teacher was mildly interested. But when I shared the IQ results plus the Explore a few weeks later and asked for a meeting to discuss accommodations, everyone from the principal on down was immediately on board, and they were extremely proactive in their ideas. (He is at an HGT school, however, so I didn't have to convince anyone of the need to accelerate.)
I would also suggest you go to the Davidson database and read as much as you can about acceleration, so you'll be well-versed in the research and can more effectively advocate.
Good luck!
