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@Fizz - Wikipedia says (buried deep in the Social and Psychological section) "People with Williams syndrome are frequently very trusting and want more than anything to make friends, leading them to submit to requests that under normal circumstances would be rejected" In other words, gullible.
MENSA actually accepts several different tests, although they do administer their own. I personally got into MENSA based on some IQ test I took when I was ~8. At the very least, MENSA's list of accepted IQ tests would be useful: us.mensa.org/join/testscores/qualifyingscores
