Children's and adults' raw scores tend to increase from one generation to the next, hence the need for regular standardization of tests ? a fuller discussion of this, and the possible reasons for the changes, is given in Chapter 1.  The items on IQ tests invariably proceed from the simple to the complex, so that an individual's raw score (and hence their IQ) is derived from the number of items passed before they make mistakes...
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Three well-known tests are the following:  the Stanford-Binet for the ages of 2 to adulthood;  the Wechsler scales (The Wechsler Preschool and Primary Scale of Intelligence ? WPPSI ? for ages 4 to6 ? ; the Wechsler Intelligence Scale for Children ? WISC ? 6 to 16; The Wechsler Adult Intelligence Scale ? WAIS;  The Differential Ability Scales ? DAS ? from infancy to adolescence...