SBV has a SB-LM equivalency, called, i think, extended IQ scores, which goes up to 225 - here's the link:http://www.assess.nelson.com/pdf/sb5-asb3.pdf
This article is written by Dr. Deb Ruf.

WISC IV has the General Abilities Index, which I think takes out some of the scores that are less related to intelligence and tend to depress the score for some gifted kids. (Anyone who can clarify, please do!)
http://harcourtassessment.com/NR/rd...76D-D6048BD67ED7/0/WISCIVTechReport4.pdf

Here's an little tanget that may be useful - a pagelong that sells the use of the SB-V for gifted kids and talks about their nature a bit: http://nswagtc.org.au/info/articles/Smith_Stanford%20Binet%205.PDF

I hope this helps. I sure would hate to participate in the "bait and switch" that I belief that the school may be engaged in. OTOH, if your private psychologist looks at the Ruf article and likes it, you may be on your way to an accurate IQ score that serves your purpose.

Best Wishes,
Trinity

Coaching available, at SchoolSuccessSolutions.com