Pupils at Barry Comprehensive School are among some 2,000 Welsh teenagers receiving their improved English Language GCSE results today.
Headteacher Gerard McNamara told ITV Wales his pupils were 'delighted' with their higher grades and were now able to focus on their A-levels.
Welsh exam board the WJEC was ordered to re-grade the papers in a controversial move by Education Minister Leighton Andrews.
It followed concerns that a change in grading boundaries meant some students were awarded lower grades than expected.
However, pupils in England who sat the same exams set by the WJEC will not have their grades changed.