IQ Test

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Learn about IQ

Short, plain-language articles about intelligence, IQ scores and how reasoning tests work.

What is IQ, really?What an IQ score measures, why the average is 100, and what it cannot tell you.4 min read IQ score ranges explainedWhat 85, 100, 115 and 130 mean, and how many people fall in each range.3 min read How picture puzzles measure reasoningWhy matrix puzzles work across languages, and the five puzzle types used in this test.5 min read A short history of IQ testsFrom a Paris school project in 1905 to the Flynn effect: how intelligence testing took shape.4 min read Can you raise your IQ?What research says about education, practice, brain training and test-day conditions.4 min read How to get an accurate resultPractical tips for setting up, pacing yourself and solving puzzles without overthinking.3 min read