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The study, by think tank CentreForum, looked at pupils' achievement by taking into account factors including poverty, ethnicity, a child's first language and gender, which can skew exam performance.
Taking these factors into account, it was estimated that 54 per cent of pupils in Sutton would achieve five or more A*-C grades at GCSE including English and maths. Last year 65 per cent made the grade - 11 per cent more than expected, placing Sutton at eighth in the country.
Cllr Kirsty Jerome, Executive Member for Education and Schools at Sutton Council, said: "Narrowing the gap between the achievements of young people from different economic backgrounds has been a priority for us for a long time, so I'm delighted our schools' success has been recognised nationally.
"We have some of the best state schools in the country which means that young people in Sutton can enjoy a first class education no matter what their background.
"We're determined that this will continue for future generations, so we are continuing to expand our primary schools and and we are alo lobbying the Government for more funding for education in Sutton."
Sutton was praised for its achievements in helping children from low income families in a recent Ofsted inspection of its children's services department. The report, published in November, said: "Children from families with low incomes consistently do better than the average for such groups in similar areas and the gap between these children and their peers in Sutton has narrowed more than it has nationally in recent years."
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