Estyn warns of 'unevenness' in school standards
29 January 2013 Last updated at 08:27 GMT
Wales' schools inspection body Estyn is concerned not enough is being done to get the most out of the best pupils.
In its annual report, Estyn said fewer schools achieved good or excellent inspections compared with last year.
Estyn chief inspector Ann Keane told Felicity Evans on BBC Radio Wales that the main concern was the "unevenness" in pupils' performance due to the difference in the quality of teaching and learning.