Earlier quoted context omitted.
Its further biased by how many iq tests the testee has done before. Honestly, iq tests are pointless unless you're selecting for people that are willing to invest time into worthless knowledge in order to win in a contest. Which is a valid criteria, considering that these are the most motivated people... Its just not "intelligence", though that itself is just as pointless to measure.
IQ tests are not pointless, the scores have strong correlation with lifetime achievement and are useful for population statistics about things like educational outcomes and the harms of childhood malnutrition. The meaningfulness of the test score breaks down if someone carries out a campaign of preparation, but that doesn’t make the tests useless. IQ testing gets a lot of flak from people who seem to have an axe to g…
As I said before, the iq test mainly measures how much the participant is motivated... Or so many other reasons which are loosely correlated with professional success such as enjoying puzzles and figuring things out etc.
It just doesn't say anything about "intelligence", and measuring that is pointless, because it's not even possible to clearly define it... like so many terms, there are as many definitions for it as there are people in the room.
But even if you use the official definition of it being the ability to apply knowledge I'd still disagree with the usual iq tests measuring that. They're puzzles at best and measuring how someone can apply knowledge is not that easy to standardize.