[wavemode]

Your score on an IQ test is reflective of your percentile amongst all IQ test takers. That is, if 50% of takers did better than you and 50% did worse than you, then you score a 100 (regardless of the actual number of questions you got right or wrong).

So, yes, IQ scores always necessarily follow a normal distribution - because that's how the scores are determined in the first place.

[lifthrasiir]

If that's true my IQ score is necessarily updated every time other takers take the test, because it necessarily depends on the current distribution right now. In reality such update happens very rarely and most IQ tests would give you a confidence interval instead, which is based on the distribution constructed via the past validations. There is no guarantee that those scores are indeed normal.