Wow Dandy, those are some impressive numbers! I'm with Cathy A - your child will know he's different, and there are some ways of telling him why without going into details. E.g., "Everyone's brain works a little differently. You will be able to learn some things really quickly without much, if any, repetition. Most people will need to have several repetitions over several school years to really learn something, and it is helpful to remember that everyone learns differently and try not to be upset when people don't get something right away that you might think is easy." (This is kind of what we told our DS when he was getting frustrated trying to teach his grandma how to play a computer game.)
Your tester might have some good explanations for what to tell young children about test results.
