Even with a FSIQ at the 99th percentile, he is more than moderately gifted. Unless your community is a planned community of Intertel members or something, I can't imagine that those scores aren't that special in your area. A district of high achieving professional families will likely have more gifted kids than avg, but I'd be willing to bet that a lot of their kids fall around the 95th-98th percentile, not above.
With the achievement scores, I'd say that you have good data to support your request. Like others have mentioned, write up your notes first so you stay focused! What was his PRI score on the WISC? That's the part that most schools look at when identifying kids as gifted in math. If that was high, that might provide you further ammo. Good luck!
This is interesting - I do know that in his school something like 40% of the kids score over 90% on the state standardized test - but as you point out and as I should know after reading about above-grade testing that prob. doesn't give the full picture.
His PRI was 137 (99%). This plus his 97% on the SCAT suggest to me that a 1-2 year subject accleration in math makes a lot of sense. All I really want them to do is to adequately assess him to see where he should be, so that we have a good sense of whether he should go up 1 grade or 2 (my instinct is 2, but hard to tell, and based on prior conversations with his teacher, she seems to think he shouldn't accelerate unless he is already at the 90% at that grade, which of course makes no sense - I am bringing the "Developing Math Talent" book with me, and have copies of the page discussing assessment scores and what they mean). I am not sure the subject acceleration will address the pacing issues over the long haul, but it will certainly help a lot (and once he is done with 5th grade math there are a lot of levels starting in 6th grade that should address the pacing issues, assuming we can deal with scheduling between elementary and middle school, which is a whole other issue I am sure they will throw up as a roadblock).
I am going to suggest that they not make the acceleration until next year, but assess now and figure out the number of years to skip and then spend the rest of this year focusing on any gaps. Does that make sense - or do you think I should push to have him accelerated immediately.
Cat
