<P> High IQ societies typically accept a variety of IQ tests for membership eligibility; these include WAIS, Stanford - Binet, and Raven's Advanced Progressive Matrices, amongst many others deemed to sufficiently measure or correlate with intelligence . Tests deemed to insufficiently correlate with intelligence (e.g. post-1994 SAT, in the case of Mensa and Intertel) are not accepted for admission . As IQ significantly above 146 SD15 (approximately three - sigma) cannot be reliably measured with accuracy due to sub-test limitations and insufficient norming, IQ societies with cutoffs significantly higher than three - sigma should be considered dubious . </P> <P> Some societies, including widely known societies such as Mensa, accept the results of standardized tests taken elsewhere . Those are listed below by selectivity percentile (assuming the now - standard definition of IQ as a standard score with a median of 100 and a standard deviation of 15 IQ points): </P> <Ul> <Li> Mensa International--as of May 2017, ~ 134,000 members from ~ 100 countries; current annual dues as of November 2017 for American Mensa are $79 (dues differ by country); Life membership cost varies by age . </Li> </Ul> <Li> Mensa International--as of May 2017, ~ 134,000 members from ~ 100 countries; current annual dues as of November 2017 for American Mensa are $79 (dues differ by country); Life membership cost varies by age . </Li>

What is the top of the iq scale