[lordnacho]

But it can make perfect sense that your rank doesn't change within your cohort. The better you are above your cohort, the more encouraged you are, and the more help you'll get from the system. So in that sense it can be the case that it's very hard to change your intelligence.

[rowanG077]

That's an assumption. It could be true or not. If true you'd expect steadily increasing IQ stores for people who are slightly above average, which is not what happens. The same effect should be observed in weaker students if it's true. I'm not interested in conjecture. I'm looking for peer-reviewed papers.

[lordnacho]

I struggle to remember the paper, I'll post it here if I think of it.