Worse, IQ tests are catnip for people who take IQ tests. If you practice IQ tests, your IQ will increase not because you've become smarter, but because you have more experience with IQ tests.
I have always wondered how do they say IQ tests can't be gamed or learned, but I never believed that. There really must be certain number of standard pattern matching ways that can be applied. Just cram these like leetcode and you should get better.
This, specially the pattern matching. Sequences, dominoes, there's not many ways they can be arranged. The first time people see them they will be stumped, but after knowing how they're made, the tested can figure how the testers think and answer them easily.
Another example is language and vocabulary, which are heavily influenced by culture and education. If IQ is going to measure education too, it would be valid to include number sequences that are the even digits if Euler's number, or names of famous astronomers without the vowels.
Yeah. I did pretty well and I'm definitely not Mensa smart... but a lot of the middle questions were pretty easy to pick up on... or/nor/differences/unions...
And an opportunity for people looking for people with whom to have some productive exchange.
People who already tried some selection filter before (the IQ), will have no issue applying another afterwards (and discard e.g. the pure narcissists).