The Chief Inspector of Education in Wales, Meilyr Rowlands, says there is a 'big difference' between the best schools and those that are struggling.
His comments come as Estyn publishes its Annual Report, which found progress in:
- Basic numeracy and literacy
But there are concerns about the gap between the best schools and those that are struggling, with Estyn stating there's 'too much variability in the quality of teaching and learning in Wales’ schools'.
Mr Rowlands told ITV News that leadership can make all the difference, with the schools that have good teaching and learning, also having good leadership.
One of the schools credited with good leadership is Rogerstone Primary School in Newport, who have seen significant improvement over the last few years.
Headteacher Steve Rayer says they have a 'whole team' approach, with everyone clear on their roles and responsibilities and the future aims.
The Welsh Government say they welcome Estyn's report, and Education Minister, Huw Lewis, will respond formally next month: