Yes, breath.

I believe the IQ test they are talking about is the WPPSI -
http://en.wikipedia.org/wiki/Wechsler_Preschool_and_Primary_Scale_of_Intelligence

The fact that the person administering the test is nice and calm with your son is a great sign.

FWIW my DS was tested at 6.5. He sat under the desk for 1/3 of the testing, spun in his chair, threw his pencil around and was an all around disaster. I sat in the corner and cringed thinking the tester was thinking I was a nutcase for thinking he was even remotely bright. In the end she saw through it all and he somehow came out with gifted scores that in many ways exceeded what we would have ever guessed. Good luck and breath.