I found this online version of Raven's Progressive Matrices IQ test. I made the mistake of taking it. I'm sure that my score (very modestly above average) would give a lot of comfort to my critics. Needless to say, it didn't do much for my ego. I tried to come up with some good excuses for the difference between my inflated self-estimate and my actual score.
Supposedly such tests measure fluid intelligence, the ability to reason quickly. I'm now old enough that such abilities are in significant decline. Maybe it's normed against the population of internet IQ test takers, who might be smarter than the average bear? On the other hand, spatial reasoning has always been a weak area for me. Maybe I'm just not that bright.