Top maths pupils 'fail to keep up with world's best'
22 February 2013 Last updated at 19:35 GMT
The ablest primary pupils in England almost match those in Taiwan and Hong Kong in maths but fall back by the time they are 16, a study suggests.
The top 10% of English secondary pupils also drop behind those in Australia, Scotland Slovenia and Norway, analysis of international test scores indicates.
Ministers said their reforms would "drive up standards."
Reeta Chakrabarti reports.