iq tests are like any one-time static test.
You can score better or worse depending on the time of day you take them. Your brain does certain kinds of tasks better at certain times ofthe day. Depending what is going on in your life any given day can affect concentration and thus, test outcomes.
I once took two IQ tests the same afternoon.
The first was a more or less standard type, and I scored 131. High, but I’m not getting any nosebleeds.
The second was a less common variety on which I scored 167, which would put me into super-genius territory.
The format had me listen to the test giver read a long essay on an obscure topic, in this case the specifics of Greek religion, as opposed to Greek mythology. Cults, priests, sacrifices and all that.
The idea was that if you remembered more of what had been read , you’re more intelligent.
However, I’d just a couple of weeks before read a rather long book on the subject, so the read-aloud essay was pretty much a review on stuff I was already familiar with.
Sadly, I’m not that smart!