These "National Challenge Trusts", in Essex, North Yorkshire and Hull, target schools where fewer than 30% get five good GCSEs including English and maths. The schools are partnered with and run by successful educational institutions such as other schools or colleges.
There were 638 target schools when the controversial scheme began in June.
According to the Schools Secretary Ed Balls, about 475 would remain below the 30% target following the GCSE results from this summer's exams.
Local authorities were told to come up with improvement plans.
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