Balanced schools - do they make a difference to social mobility?

There is research that indicates different forms of diversity help all students achieve better. But is there a tipping point for better educational achievement and higher social mobility outcomes? We know that sorting of the school population is heavily influenced by parental choice. In some cases, parents choose to send their children to independent schools. Seven per cent of the secondary school population are educated in independent schools, but we know that these children come from the upper deciles of the hous...