Retesting is a tough call. Common sense tells us that of course, if he's more mature and settled the scores would go up. However, statistics tell us that the scores will go down. That's the prediction for all gifted kids, just because their first batch of scores were so high. And you might find that the 17/19 scores to drop to 16/18, which are also quite gifted. But that might balance out a 13 going to 15. It's really hard to predict. The more I study IQ tests, the more flaky I tend to find them,
.
His current scores though are no doubt about it gifted, and I would expect the giftedness to be obvious on future testing as well. The "how gifted" question though is much harder to answer, especially with one day of data. If you do feel in time you have reason to pursue something that requires a higher number, by all means try the retest!
