"The scale of our pupils’ aspirations is highlighted by what they plan to do next.”

The school’s sixth form educates 230 girls and in 2011 86 per cent of students achieved A*-B results in their A-levels.

This year, 12 per cent of the school’s university applicants accepted conditional offers from Oxford and Cambridge.

Ms Barnett said: “Typically—75 per cent of the students achieve places at highly competitive universities.”

Stratford Grammar and Warwick School were the only two schools in Warwickshire where 100 per cent of pupils achieved three or more A-levels, or an equivalent qualification.

Ms Barnett said: “League tables focus on just one element of what makes an excellent education but as competition for university places and jobs increases, it is vital that young people do realise their full academic potential during their time at school.”

King Edward VI School, in Stratford, which had 164 sixth form students last year, was ranked fifth best school in Warwickshire. But headmaster Bennet Carr warned that national league tables should be taken with asignificant pinch of salt.

“The latest tables produced by government are as much a reflection of how many qualifications a student takes as how well they do in them,” he said.

Alcester Grammar School have 450 pupils in sixth form and were ranked ninth best state school in the county.

Vice-principal Jeremy Slater said: “We are very pleased. Two-thirds of our pupils are unselected and most of the schools above us select their pupils. We are also absolutely delighted that 11 students had Oxbridge offers.”

The Key Stage 5 results throughout Warwickshire improved with the overall pass rate for A-level subjects at 99 per cent and success noted in other Level 3 qualifications such as BTECs, NVQs and other practical and applied learning qualifications.

This means that over 4,000 students this year acquired the equivalent of at least two A-level passes.
The average grade for A-level and equivalent examinations is just above a grade C and continuing to rise.