If the school says they use the IAS for GT id, I might be inclined to be skeptical that they know what it is or are using it appropriately. Our school has said something similar in the past about IAS being an achievement test. We cleared that up after we just got a copy of the guide and scored it at home before. There's nothing on the IAS that you as a parent could not approximate how the school would respond as long as you have some IQ and achievement test scores.

Warning: sleep deprived