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Re:Income mobility has been rising fastest in Britain by thaumasiotes on Friday July 06, 2018 @01:35PM (#17473391)
You seem to be assuming that admissions is based on a lottery and expulsion cannot occur.

You might note that at what are considered "good schools", not only are neither of those things true, but trying to implement either would cause the school to be quickly abandoned.

Re:Income mobility has been rising fastest in Britain by isostatic on Friday July 06, 2018 @04:11PM (#17474733)
you get knobheads whatever the admission policy. And the number of expulsions from schools is pretty much zero