In general, I would have suggested the WISC IV and WJ III (IQ and achievement) duo... or maybe the WISC IV (IQ) alone...but it seems to me, from what I've learned on this board, that the answer to this question depends on your school district/school.
Do you know any parents who have successfully advocated for their child at your school? I think I might quietly ask them what type of information the school required before making the change. They might be full of helpful advice...
I hope someone else will chime in with their thoughts.
