Update: Increasing IQ is trivial seems relevant. I think the case is far from proven, but worth a look.
It’s worth mentioning that IQ tests have substantial error bars, and those get wider near the tails. Once you get higher than a few standard deviations (15 points each) above the mean (set at 100) the differences become too hard to measure to be very meaningful for individuals, a single one of whom can show substantial variation from among the different IQ tests.
Update: Increasing IQ is trivial seems relevant. I think the case is far from proven, but worth a look.
It’s worth mentioning that IQ tests have substantial error bars, and those get wider near the tails. Once you get higher than a few standard deviations (15 points each) above the mean (set at 100) the differences become too hard to measure to be very meaningful for individuals, a single one of whom can show substantial variation from among the different IQ tests.