Catharine Hollins, 18, from Hale Barns, is celebrating after receiving her A-Level results at St Bede's College in South Manchester.
She gained As in biology, chemistry and physics and has secured a place at Liverpool University.
Her mum Janet said: "I am very proud of my daughter's achievements. Neither Catherine or her older brother Adam, who also attended the school, would have achieved what they have done without the dedication of all the staff at the college."
The College in South Manchester, has received a 100 per cent pass rate with 71 per cent of Upper Sixth students gaining A* to B grades.
More than 33 per cent of its students gained three A grades at A-level and all of its Oxbridge candidates secured their places at the prestigious colleges.
Headmaster Mr Daniel Kearney said: "We are delighted with the results the sixth form have achieved yet again, a 100 per cent pass rate has been achieved. This success is a result of excellent teaching, conscientious pupils and supportive parents."
"The college believes that all pupils learn more effectively and develop holistically in an environment in which they are positively encouraged and in which they feel secure and valued for the unique contribution only they as individuals can make.
“In such an atmosphere of mutual support and positive encouragement, each child’s potential is developed and their personal academic achievement is boosted."