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However, we can healthilyâ¦ assume that had some equivalent of an IQ test existed in history, that great thinkers such as Socrates, da Vinci, Isaac Newton, and so forth would have score up there.   Marilyn vos Savant has a IQ of 230. She has the highest recognised IQ score.
The Stanford-Binet and Wechsler tests use the same score scale: average intelligence is between 90 and 110; genius, or gifted, is above 140; and below 70 is considered mentally deficient. The Cattell test uses a wider scoring scale, so that scores between 90 and 140 are average, and genius level IQ is over 160.he three main types of IQ tests all use a scoring scale from 0 to 200. Test scores are calculated so that the average score for each test is 100 -- so a 100 IQ score designates average intelligence.