IQ levels are calculated by taking a standardized test, like the Stanford-Binet test, and comparing your scores to those of others who have taken the test. The average IQ score is set at 100, and most people's scores fall within a range of 85 to 115. That's like the middle 68% of the population, to get all statistical on you.
But here's the thing: IQ scores are not absolute, and they can vary depending on the test and the person taking it. It's like trying to measure a moving target - you might get a different score each time you take the test. And, let's be real, practice makes perfect, so if you've taken practice tests before, you might do better than someone who hasn't.
