Immigration has been a key reason behind London's high achievement in school standards, the former education secretary Michael Gove has said.
Addressing an international education conference, Mr Gove highlighted the importance of immigrant and refugee families pushing up results.
He said migrant parents had "high expectations" for their children.
But Mr Gove, a leading campaigner for Brexit, said migration had also created "pressure on services".
The capital's schools have outperformed the rest of England.