A Gainsborough secondary school is failing to meet Government minimum targets aimed at ensuring pupils gain five good GCSE grades.
New figures show that 312 secondary schools in England did not meet minimum benchmarks this year.
These schools failed to ensure that at least 40 per cent of their pupils gained at least five C grades at GCSE in 2015.
From next year, all schools will be measured that way.
And according to new league tables published by the Department for Education, one of these under-performing schools is in Gainsborough.
The Gainsborough Academy, on Corringham Road, Gainsborough, failed to meet the benchmarks, as only 20 per cent of pupils managed to get the set grades.
In total, 250,955 youngsters, nationally, are being taught in under-performing state secondary schools, the data reveals - down from 274,351 last.