If tutors really do reliably produce two-sigma learning gains, then why aren't most top achievers the product of tutors? Yes, they're expensive, but perhaps "only" 2-3x private school; there are a lot of wealthy parents. Diminishing returns for high achievers?
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partly because all of us, including me, forgot that the tutoring portion only accounts for one of the Sigmas
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Maybe! It's hard to imagine a serious tutor (i.e. outside the pressures of a state-mandated scope+sequence) not implementing something like mastery learning.