The education minister plans to exclude Wales from this new element of the global assessments.Read more
BBC Wales Political Unit
Reports say children who do regular homework get better exam results - but what do the pupils think?
Pembrokeshire student Sarah takes part in a school swap in South Korea and struggles with the long day of study.
The education secretary says there is more to school children's performance than the results of the international Pisa tests.
Carwyn Jones says ministers still have a target to improve Welsh pupils' scores in a global education test.