The Labour Party is promising to cap class sizes at 30 pupils across all schools in England if it wins next week’s election.
The pledge is an extension of a commitment in its manifesto to limit classes to this size at all primary schools.
The party said it would fulfil the pledge by recruiting nearly 20,000 extra teachers over five years.
The Conservatives said English schools were rising up international rankings.
The party has pledged an extra £14bn over the next three years for schools in England.
Labour’s pledge to recruit nearly 20,000 teachers is similar to a promise made two weeks ago by the Liberal Democrats.
Lib Dem education spokeswoman Layla Moran accused the party of trying to “copy” them, but added that Labour had “no hope of meeting this target”.
She added that Labour would not be able to “square these promises” with leaving the EU if voters back the party’s Brexit deal in its planned referendum, due to “thousands of EU teachers coming to work in schools each year”.
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