I've been really sceptical of IQ measurements since when I was about 14, I took one that said my IQ was 186. And I was like "idk I think I'm just super into online quizzes right now and know how tests work (...partly due to my practice on quizzes to decide if I should marry Aragorn or Legolas)"
The indescribably talented @jamieloftus.bsky.social did a podcast called "My Year in MENSA" or something like that and it was illuminating for many reasons but the undergirding premise is that IQ is basically fake, or rather its so unscientific in its basis that treating it scientifically is foolish