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I think a lot of people just assume that human populations somehow fit a bell curve neatly over various traits, but many of these tests are *designed* to clean up the curve by tweaking test items until beta populations fall along the right line
This might mean adding redundant "easy" questions to push more low-scorers up to the middle or using time pressure to push slower readers/thinkers down to the middle, depending on how the curve looks on initial tests. Or vice versa.
The problem isn't that high-scorers are bad at the thing that's being tested for, it's that there may be some or many folks scoring in the middle who are equally good or better. When you tweak items to produce a desired curve, you muddy the waters re: what the test actually tests
If top scorers *are* really good *and* really fast, isn't that fine? Well, no. In the real world, cognitively-demanding work isn't a speed run. If top scorers get the best opportunities, people w/ traits preferable to speed (creativity, conscientiousness, etc.) may get pushed out
Is there a good book/article you can recommend to learn more about how tests are designed to fit these curves?
Malcolm Gladwell did a two-part podcast on the LSAT with some interviews with people who design the test: Part 1: http://revisionisthistory.com/episodes/31-puzzle-rush … Part 2: http://revisionisthistory.com/episodes/32-the-tortoise-and-the-hare … This book also covers it a bit, though it's not central: https://www.amazon.com/Measuring-Up-Educational-Testing-Really/dp/0674035216/ …
This might be a bit uncharitable. Psychometricians are looking for items with a range of difficulties that can discriminate at different levels of ability. If the distribution ends up being really right-skewed, it means your test can't tell people apart at low ability levels.
Conversely, if the distribution is really left-skewed, then your test is probably too easy, and you're not discriminating at high levels of ability. Time pressure is one way to push that needle, but often they really do just come up with harder questions.
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