One in 10 secondary schools is failing to help pupils reach their potential, Government figures show.
The 10.7% are “coasting” – where fewer than 60% of pupils get five good GCSEs and below-average numbers make the expected progress.
Liberal Democrat leader Tim Farron said: “This is a damning indictment of the Government and their record in education .
“How can they let all these children down and allow so many schools to coast?
"All Tories seem to care about is tinkering with the system.
"They should let teachers teach.”
The Department for Education ’s report, “Coasting schools: provisional data”, outlines when experts judge a school to be coasting.
Rates were worst in Lancashire and West Yorkshire at 16.8%, and 16.4% in East Midlands and Humber.
The Department for Education report said there were 327 secondaries that were coasting.
Among primaries the number was 479, a 3.5% rate.