If you want to increase student performance with a eugenic solution, the problem has always been developing an effective selection criteria.
My suggestion is to simply select by political affiliation. Democrats have shown, in the last two elections, that they are either profoundly stupid, or evil.
It will shift the Mean of the Bell Curve 50 % to the Right, and open a great deal of real estate and employment to exploitation.
I’m just pointing out that there are only two solution sources to pick techniques from: Nature and Nurture.