Well that's easy: to change education for people based on their abilities. Any specific class can only be educated to the lowest level everyone in the class wil

Well that's easy: to change education for people based on their abilities. Any specific class can only be educated to the lowest level everyone in the class will support. So you split up classes by IQ, you don't even give more opportunities to the "high-IQ" class. You just split them up. Nothing more. Generally this is not based on actual IQ test results, but on teachers impressions. And they keep "secret" which is the high IQ class. And if a kid is really motivated to be in the better class, change the kid to the other class (and vice-versa) if at all possible. Of course this worked better with 15 kids-per-class than with the current 40 kids-per-class education system. This is doing a lot of good, and has been for decades. Essentially it results in a smarter and more capable society, because people can be educated much closer to the limit of their abilities.