I think it's more useful to think of IQ tests as a tool rather than a measure. What are you using the tool for? To distinguish the intelligence levels of long dead historical figures... ok. I mean, I don't think we need to have a discussion about the methodology because that would be like me giving you tips on how to melt and re-freeze every ice cube in your fridge. Are you going to use it as a label to put on a child so they can either give up on their career early or (equal and opposite) decide they're a child genius and give them all sorts of neurotic problems they'll need to work through in their early 20s? Are you going to start to try and use it to make arguments about various racial groups in the US? Again, I'm less interested in the methodology there versus why you feel the need to pursue that particular agenda.