This is surely a fairly highly rated idea. At least where I live now and where I come from (at the time I lived there) it was regarded as more important to raise the standard of the poorest students than to raise the standard of the top performers for instance. At least when I was in primary school my teachers spent more time with those who found studying difficult than those of us for whom it came easy. It was made clear to me as a high achiever that help was always available but, as it was clear that I could work on my own, that I was expected to do so.

It also surely accords with the Marx's slogan:

"From each according to his ability, to each according to his needs[1]"

Perhaps this idea isn't so popular as it used to be.

[1] https://en.wikipedia.org/wiki/From_each_according_to_his_abi...