Testing - both IQ and achievement - helped us too. We were able to take our IQ results (with an extremely helpful detailed report explaining what it all meant) to the school, and this prompted them to suggest achievement testing by the school psychologists. When they found out what they were dealing with, they now plan to offer differentiation for DS when he starts kindergarten in the fall, and they said they would never expect him to have to sit through learning how to read or early math. So, some big plusses (with the caveat that we aren't in school yet). Now we have a pretty good picture of what level DS5 is operating on, and if the particular school situation doesn't work out, we'll know what red flags to look for and what sort of alternate schooling we should seek.