Suppose Oxford and Cambridge were to ask every state school to identify, at 15, its brightest pupils academically (one, two or three, depending on size). Suppose those pupils were given every possible support and guidance in A-level subject choice and teaching. Suppose they were invited annually to week-long summer schools where they could form their own peer networks of solidarity and support.
We have a word to describe such a practice.
Oft considered a no no in our famously egalitarian education system.
Hell, why not go the whole hog. Take the 10% who might possibly get there and stick them in a different school?
We could call them grammars.