I had mine tested in second, and sixth grade. It was the same. But it has nothing to do with intelligence acquired, only with how well intelligence can be aquired. But I noticed that the people with normal - gifted intelligence worked harder and got better grades. But those who were either below average or genius were lazy and did nothing in school. The below average were playing with action figures while the genius' were playing with puzzles. Or in high school, the below average were smoking weed, and the genius' were selling it to them. (This is of course a personal observation of one school setting, in no way does it try to state fact about the whole of society.)