With two children in a program that accepts only child with IQs 130+ (but allows outside test scores and accepts scores from children as young as 5), I feel like I see this in the children and now teens I know from the program. I know they all tested in, but some who once appeared higher-ability now appear "average bright." Others have remained obvious outliers, and some started as not that obvious and have become more so. I have to mention that as the years have passed, I have learned just how many kids in this program did not "pass" the school district IQ bar and were later admitted after their parents sought private testing (that they passed). It's a lot. I would say, over 50%.
Personally, with my own children, I once though both of their tests were off in opposite directions and now think that both tests were actually accurate.
