One of the multitude of reasons you see so many suburban middle/upper-middle class folks trying to dismantle the public school system is because many educational professionals will intentionally mix students with both strong and weak backgrounds together.
From a research perspective, it's been shown that student mixing of this nature results in stronger performances from both the weak and the strong students. Weak students get peers who can support them and strong students reinforce their own understanding by teaching others.
Good luck explaining that to Tommy Twelve Year Old, though. More likely, Tommy will come home every day and complain to mommy about how all the kids in his class are stupid and he's constantly having to teach them basic stuff. Mommy would rather get a voucher to send Tommy to a charter/private school where he can be with "other smart kids."
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