Generally, they say IQ doesn't change much over time. Our Dr said maybe a few points in either direction, but overall it will remain stable.
If my son has a GAI of 154, but a processing speed score of 88, will that possibly change as he gets older?

He's in 2nd grade now, but as he gets older we would like to find a different school for him - a place that has some sort of gifted program.

His current FSIQ is 135, but if his processing speed improves like his Dr said it would, wouldn't that cause him to score higher the next time he takes the test, resulting in a higher FSIQ?
He will again take the WISC-IV in 5th grade (the Dr wants to administer the test every few years because he has epilepsy and she wants to make sure it isn't causing disruption with learning).