When we had him eval. we were told that he would probably never let on to the teacher that he can do more than what is being taught,
Call that tester and ask what it was that the tester saw that let him/her to make that comment. It's not part of the standard testing.
You may have to take the lead and show him some hard afterschooling stuff to make it ok for him to show you his stuff. I don't mean yelling or pushing, just leaving hard books around the house, so saying 'I think you can do this - it may take a few tries.'
G
