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[–] 1 point 4 months ago

Take the test on a different day, or sleep more beforehand, or do a different test, and your IQ will change.

Not as much as people think. We're talking around 5 points of difference - 10 at max. Broadly speaking, the results of a well-designed test are highly consistent over a long period of time as long as it's measured under similar conditions. It's among the most repeatable tests in all of psychology.

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