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.
Emails released by Welsh Government show that the exam board warned that a regrade of GCSE English papers would affect integrity
Education Minister Leighton Andrews has told AMs he stands by his decision to order a regrade for this year's English Language GCSEs
Following the decision by Westminister to replace the GCSEs in England, the Welsh Government says it won't rush into a decision here.