There is a growing trend of primary schools running Easter holiday revision classes for formal tests, known as Sats, a teachers’ union says.
The NASUWT union says “cramming sessions” are becoming more common in schools ahead of the tests sat in May.
It says children should not be in school over the holidays, but should be spending time with their families.
Education Secretary Damian Hinds said Sats were tests of the education system in England, “not our children”.
The results of Sats tests taken by 11-year-olds are published each year in primary school league tables, published by the Department for Education.