Frenchman Alfred Binet developed the first of the modern day IQ tests. In addition to developing a framework for measuring intelligence, Binet taught the world that unlike the measurement of other human characteristics such as weight and height, IQ scores would necessarily be accompanied with a degree of error. The academic literature has gone one to validate Binet’s theory: the coefficient of correlation of one person’s IQ score with him/herself is 0.95. In other words, the same individual may experience some degree of IQ score variance depending on the test taken, the state of the test taker on the day of the test, and the same person’s score may even vary on the same test! On this latter point, practice effects are well known: test takers tend to boost their scores by an average of 8 points when taking the same IQ test twice. For this very reason, some high IQ societies such as Mensa will have you wait a full year before you are able to test again assuming that you failed to qualify the first time around. But increasing your score does not mean that you are increasing your general intelligence. So if you are serious about getting a true approximation of your global general intelligence score (G) it is useful to seek out new IQ tests with new IQ test questions to help zone in on your true IQ score.
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