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Just downloaded; haven't read. Before reading, the obvious first questions are about self-selection and attrition. @KirkegaardEmil, can you save me the trouble? https://twitter.com/FrazeTansy/status/1060926551045406720 …
Author is some random dude who wants to write a Bell Curve killer book, and yet he commits sociologist's fallacy left and right, cites his own random papers against large hereditarian reviews. It's been 9 years since that paper and the book still not here.pic.twitter.com/0rroh6Wt7r
As for his paper, I can't really make sense of it. It's an unsystematic review of some government programs reported in grey literature. He thinks the evidence is limited and the programs be investigated in large randomized trials. I agree with that, so what's the claim here?pic.twitter.com/NL4eq0yd3b
I was able to find one RCT along the lines he wants, I think. Too small for my usual criteria 312<500, and found the usual small boost in scholastic scores immediately following intervention on some tests. No follow-up. 
https://dash.harvard.edu/bitstream/handle/1/28979949/2011_CanMixedMethodLiteracyIntervention.pdf?sequence=1 …pic.twitter.com/jFpAZjbiAq
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