Excerpt from What is worth teaching.

A key feature of all types of exclusive or elite schools is their students live in a restricted universe. The elite school selects clientele out of the larger population, and thereby construct a narrow sphere within which its clientele must socialize. This practice alienates the school from its milieu. Wherever admission policy departs from the principle of neighbourhood school population ceases to represent the social reality around. This would be true anywhere in the world, but it is more sharply true in a society like ours where every milieu is economical heterogeneous. The wealthy Indian likes exclusiveness, and so does the middle class, but neither can manage without domestic servants and a whole range of other services. Since each mansion has a servant's quarter and a nearby slum, the out-of-school environment of an Indian child invariably consists of both riches and poverty. This applies just as well to villages as it does to cities.
This is why when a school closes its door o the poor, it ceases to be a part of the milieu