Besides the scores, would testing also buy you some advocacy and guidance from Dr. Palmer? If so, I say yes.

Do you think your son's SB 5 scores will be higher than his WPPSI scores? There are plenty of bored kids who are not in the DYS range, and plenty of advocacy advice here - as good, I think, as inside the walls. But if your heart is telling you that the other scores are an underestimate - spend the money. If you are right, then you'll be so relieved you did.

Good luck either way,
Love and More Love,
Grinity

Coaching available, at SchoolSuccessSolutions.com