By Nick Morrison
Schools have been accused of pushing out students with low levels of achievement, in a practice where the students become the victims of a high-stakes testing regime.
School inspectors have identified 19,000 students who left their publicly-funded school shortly before crucial public examinations.
And while around half of those moved to another state-funded school, around half did not, and simply vanished from school registers.
Some may have moved into fee-paying schools, but with no information on their destination, the likelihood is that many will have effectively left education altogether.