The Wechsler Intelligence Scale for Children (WISC) is available for children ages 6-16, and the Wechsler Preschool and Primary Scale of Intelligence (WPPSI) is an accurate IQ assessment for children ages 2-7. [2] X Research source The WAIS is not considered an accurate IQ measurement for extremely high or low IQs (above 160 or below 40). [3] X Trustworthy Source PubMed Central Journal archive from the U. S. National Institutes of Health Go to source

It is not uncommon for preschoolers to receive a low score on the Stanford-Binet assessment, not because of their intelligence but their unwillingness to cooperate.

Generally, the Mensa assessment takes around two hours.

Mensa International offers a free “Practice Workout” online.

Don’t just imagine yourself doing well without working for it. Make your imagination a reality by practicing and preparing as best as you can.

Avoid drinking caffeine the day of your IQ test, as this can cause agitation. A little stress can be positive, as it’s the body’s way of telling you to focus. Excessive stress, however, is detrimental and can limit your cognitive functioning.

Stay hydrated, too. Drink plenty of water before the exam, and bring a water bottle with you to drink before you enter the testing room.

Showing up in your pajamas may seem enticing, but opt for a balance of comfort and style. Flattering clothes can help you feel confident and ready to do your best.

If you can choose which questions you answer first, spend your time on the easiest questions. This will build your self-esteem and allow you to answer as many questions as possible. Divide your time limit between the questions or sections so you can plan to tackle every question. [10] X Research source

Scores between the WAIS and the Stanford-Binet scale vary by several points.

Read your score as scaled, not linear. An IQ score of 50, for example, is not half the capabilities of a score of 100.

IQ-tests are designed with age in mind, so if you take the correct test for your age, getting a high score when you are young is not any more or less impressive than getting a higher score at an older age. In other words, a twelve-year-old with an IQ of 143 is not “better” than a thirty-year-old with an IQ of 143. IQ generally decreases over a lifetime.