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Notes -
Yes, but they also asked the teachers to evaluate their grit and self-control, if memory serves.
Interesting.
Right - if these minor efforts had good effects, it seems likely that a more prolonged effort earlier in life would have stronger impact.
Again, you aren't addressing the point that studies that screen out environmental effects will screen out the effort OP wants to do.
If I told a youth this he would probably laugh at me for suggesting that getting lectured in class from time to time had that much of an impact on his life choices.
I would happily accept a lecture telling me to work hard in exchange for an extra $100,000 over the course of a 50 year career! I would accept a lecture from you in exchange for $2000 right now! A monthly lecture, even!
Again, unless any of these studies you've dug up are looking at home life, we can assume that school intervention studies will control for home environment which means they tell us nothing about OP's plan.
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