When I was in elementary school, they administered IQ tests to all the fifth-eighth graders one year. When they gave us back our test results, they also gave back the average for each grade. My grade had the highest average, bli ayin hora.
I once took a bunch of IQ tests online. I wouldn’t have thought they were particularly legitimate, but the scores all came out relatively similar as well as similar to what I remember my score being in elementary school. I thought that was interesting.