One thing barely mentioned in this discussion is shared culture. Most of these IQ tests are administered by psychologists with at least a master's degree level education if not a PHD. I'm aware they're supposed to test how well someone can perform on a random set of questions or should I say pseudo-random set of questions. Doesn't the performance of the test takers reflect how much shared culture they have with the test administrator? Sometimes even a so called random puzzle is not really random because the chance of answering it goes up if you have a good amount of shared assumptions and mindset with the person who set the puzzle. I wonder if the reverse has been done, like have a bunch of individuals give a bunch of random questions to other individuals, and have the ones that score the least become the new IQ test administrator. I believe the highest scorers will score very low.