Indeed, because of diminishing marginal returns on studying, even being in the 50th percentile of SAT test prep hours can improve your score by 10 percentiles. It’s hard to know how many students spend 0 hours studying but it is definitely the plurality if not more than 50%. However, implementing such a study program in schools has two obstacles: (1) is forcing a student to do more than zero hours of studying the same as doing more than zero hours of studying? Will such a student just zone out and get 0 gains, but your study will book positive time spent studying? (2) 80% of the exam score will still be explained by G factor.I don’t know how many hours of studying 50th percentile is or whatever, by the way. This just comes from the math and the fact that the test scores are “ex Gaussian” - skewed normal, where the small skew is explained by everything that isn’t G, like studying.
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