The Cathedral School has reported two thirds of all GCSE entries graded A* or A, with 100% of pupils gaining five or more examinations graded A*-C.
At the top end, three quarters of pupils gained five or more A* and A grades, including Claire Shadwell who gained 12 A*s. She said: "I'm really pleased with what I've achieved! It's a great way for me to end a great time at the Cathedral School!"
Samuel Vaughan gained 8 A*s and 3 As. He said: "I'm extremely happy with my results - it wouldn't have happened without the support of my teachers. I'm really looking forward to going on to study Biology, Chemistry, Geography and German at A level."
Headmaster Stephen Morris expressed his joy at these high achievements: "Once again these are fabulous results, which show how much can be achieved with expert teaching and diligent hard work. Praised by Estyn (March 2012) as ‘one of the highest performing schools in Wales', the Cathedral School's approach of solid academic teaching in traditional subjects, along with a wide co-curricular programme and an emphasis upon pupils' leadership skills has again proved to be a winning formula. Well done to all of our pupils."
The Cathedral School has a largely mixed ability intake but has been, for the last nine years since it began teaching to age 16, one of the highest achieving schools in the UK at GCSE. Due to considerable demand, from September 2013 the School will teach up to A level.
The Year 11 cohort consisted of 61 boys and girls from Cardiff and the surrounding area.