Agreed with Dottie and Cricket2 -- so few kids in this age group can read at all, so reading scores tend to be very high and not to maintain that over time.
If you want IQ information, you need an IQ test (at this age, try DAS-II, SB-5, K-ABC-II -- agreed that WPPSI is a waste of time and money).
I'd also recommend, given the language history, that you have the eval include a broad-based evaluation of receptive and expressive language (the two most-commonly used intruments are the CASL and the CELF), including language pragmatics.
Also a very very careful developmental history by someone familiar with the ways in which both language-based LDs and pervasive developmental disorders can manifest in gifted kids -- both issues should be on your differential diagnosis. This is not a situation where you're going to get the answers you need from the school district. Sorry. That's not what districts do.
