There are serious concerns about the state of education in England's colleges, Ofsted chief inspector Sir Michael Wilshaw has said.
More than a third of colleges (35%) are now considered less than good - up from 30% at the end of 2010, according to Ofsted's annual report.
For the second year in a row, there was not one college that was judged to be outstanding for its teaching and learning.
Thirteen - collectively teaching more than 82,000 learners - were declared inadequate overall in the last year, compared to just four the year before, according to the report.
Ofsted's report questions whether the learning and skills sector - which covers further education colleges - is currently fit for purpose.
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