>>13924964IQ test are normalized statistically. What this means is that you first come up with a test that tries to somehow correlate with your overall intelligence. Then you make a bunch of people take the test and check what distribution of scores they get.
You then map test scores to IQ so that the distribution of IQ values corresponds to the standard form, meaning a normal distribution with mean 100 and standard deviation 15.
This can only work when you have enough people in your test group in every IQ range to get a proper sample, otherwise the mapping becomes meaningless.
An IQ of 198 is over six standard deviations from the mean. This is a literal one-in-a-billion event. So there's maybe ten or twenty people on earth with that kind of IQ, and that will never be enough to make a proper conversion scale.
That's not even getting into the practical problems of test retaking and all that shit.
