Take a standardized, professionally administered IQ test
Use a licensed psychologist or qualified psychometrician
Ask for a test with published norms and reliability data
Choose a test appropriate for your age group
Ensure the test measures multiple cognitive domains
Avoid online quizzes that do not use validated scoring
Take the test in a quiet, distraction-free setting
Follow all instructions exactly
Answer independently without outside help
Get your score interpreted by a professional
Compare your result to the test’s norm group
Retest only after enough time has passed to reduce practice effects