At 250 IQ, the person would be overwhelmingly smarter than any individual who has ever lived or probably ever will live on this planet. At 500 IQ, the person no longer resembles human intelligence. At 1000 IQ, the person is so smart that they are beyond any real description, possibly even an actual deity.
Mensa workout test results don’t really mean a whole lot. The workout test is not a formal IQ test, and the results you get from it cannot give you a meaningful estimate of your current IQ. It’s just designed as a bit of a primer to help people feel more comfortable taking IQ-style tests and questions.
The BMI Certified IQ Test seems to be legitimate in that it follows good principles established by psychology research. Despite that legitimacy, the test appears to be fairly unreliable when it comes to accuracy. Scores are not properly compared and analyzed, and there is evidence to suggest that scores are inflated.
IQ Test Academy is not a legitimate IQ test, and it is not remotely accurate. It does not adhere to sound statistical practices, it was not developed by any known psychologist or researcher, and the results it spits out are genuinely meaningless. The website claims that the test is only “for entertainment purposes.”
The Test-IQ.org IQ test is definitely not an accurate IQ test. It is too short, probably too simple, and it provides no rational basis for its methods of testing IQ. On top of that, it lacks any verbal processing test at all. It’s hard to say if the test was made with any legitimacy, but it is not generally reliable.
It really depends on the test. Good online IQ tests tend to get consistent results even when the same person takes them several years apart. Bad online IQ tests provide a number that means very little if anything. If you want a good measure of your IQ, you should look for tests conducted by active researchers.
Brainable is a safe site to visit, and going through the IQ test is not going to bring direct harm to you or your device. That said, Brainable does not offer compelling evidence that it uses scientifically-validated tests and methods. On top of that, Brainable does charge, so if you want a free test, this isn’t it.