Five out of the 10 highest-scoring students who sat GCSE Art and Design this summer came from the same Stanmore school - Peterborough and St Margaret's School.
Michelle Tang, Laura Smith, Charlotte Phillips, Charis Duffy and Melody Grossman, all aged 16, achieved A* mark - the highest grading possible - after being among the 36,294 teenagers who took exam board Edexcel's subject syllabus.
Sue Watts, headteacher of the fee-paying independent school in Common Road, said: "It is absolutely anazing that our school has half of the top 10 results in the country. It's just fantastic.
"Our art and design is always very strong. The students always get As and A*s but this is the first time we have had a letter from the exam board congratulating the school."
In that letter, Edexcel's managing director Jerry Jarvis wrote: "This is a tremendous achievement and is testament to the hard work students put in to prepare for the exams."
There was further celebration, Mrs Watts said, because another pupil, Hannah Gold, discovered she had earned of one of the top 10 results nationally for Edexcel's Religious Studies GCSE course.
Like all the girls at the school, 15-year-old Hannah sat her Religious Studies GCSE exams at the end of Year 10 instead of Year 11.