In my experience the child would then have be presented with a test the were guaranteed to fail just to make sure they didn't get a big head.
In my experience, the child would have points docked off the test so that he did not get a perfect score and then, the parent would not get a big head! The points docked would be for something that would have been overlooked normally (e.g. the answer was in mixed fractions when the teacher wants to see an "improper fraction" or the answer was in inches instead of feet). When a parent asks for accommodation for a very accelerated kid, they set out to show that the child "is not all that" to the parent and the child suffers, and the parent moves the child to a different school. Story of my son's life!
