When I was in first grade the entire class was given an age-appropriate (I assume) IQ test. They never told my mom what my score was, but it was higher than most. I think there might have been a couple of others besides me, who scored in the same neighborhood. We were all called, individually, to the principal’s office and interviewed with a representative from the testing service. They asked me if my parents went to college, a lot of stuff that to a first-grader seemed out there. I had no clue why I was being grilled.
Later in highschool we had IQ tests and my score was 147. I suppose such personal data can be useful, but it’s so subjective. In our town we had a long-time employee (now deceased) with a reputed IQ of around 190. He was basically a gofer — an alcoholic, legally-blind and happy with his lot.
So who’s to say.
They really can be deceptive.
I have taught kids with IQ's in the 90's who excel, and kids with IQ's in the 140's who flounder.
I guess it is all in how you use what you have.