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Yes. It appears that the more stratified educational systems are, the more variance in outcomes there is. e.g. [1] Which makes intuitive sense. While there's an intellectual argument for everyone benefiting from diversity of a student body, I'm not sure I'd expect to see a benefit in strictly measurable educational outcomes at least.

And it's fairly obvious some of the ways that motivated and high achievement students could benefit from more customized and self-paced study while it's also obvious why a group of students lumped together as low achievers will do less well.

[1] https://www.oecd.org/pisa/keyfindings/Vol4Ch2.pdf




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