Staff at the country’s largest exam board AQA are planning a second strike days before A-level results over a pay dispute.
Unison have called industrial action from August 12 to 15 – the weekend before the first exam results are released on August 18.
It follows a 72-walkout last weekend by workers, including those who help organise the awarding of grades, the union said.
AQA has now accused Unison of attempting to “disrupt” awarding and grading meetings during the strike.