Take a standardized IQ test from a licensed psychologist
Use a reputable, professionally developed online IQ test
Check whether the test is normed on a large, representative sample
Make sure the test reports a score with a clear average and standard deviation
Compare your score to the test’s official scoring method
Avoid unofficial quizzes that do not provide validated results
Review the test’s reliability and validity before trusting the score
Retake only if the test allows it under standardized conditions
Ask a psychologist or qualified professional to interpret the result
Use the score as one measure of cognitive ability, not a full measure of intelligence