The IQ Test Prep Experience. This site offers free online IQ tests for adults and is designed to be a fun way to test your intelligence and learn more about various IQ tests and their histories. While there’s no universally recognized official IQ test, there are a number of well-known tests that are used by psychologists and education
Based on my personal experience Mensa Norway test did actually give me the result that corroborates with my previous, more official tests, and the actual Mensa test. I'd say it's pretty accurate in terms of predicting your actual Mensa test results, though you shouldn't take the result as definitive representation of someone's IQ.
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