In response to the apology over missing papers in an English paper and continued confusion with Maths, NAHT Cymru director Laura Doel said: “This continues to be a very challenging exam series for our learners, many of whom have never taken exams before.

“While we anticipated some disruption, four pages missing out of an English A level exam paper is unforgivable.

“Our members have reported continued confusion over the Maths papers, citing a lack of specificity in the adaptations to the exam specifications published by WJEC. Issues with this subject have been compounded by the fact that there is a comparatively new format to the Maths exam, with very few examples of past papers to share as part of the revision process.

“We will continue to highlight any issues raised to the WJEC and we take some reassurance that the WJEC will take these concerns into consideration when setting grade boundaries. However, this will not repair the damaged confidence of pupils who may have struggled to perform at their best in examinations as a result of any confusion.

“Our leaders and teachers are working tirelessly to support learners, painstakingly talking them through any concerns they have, speaking to parents and doing the best they can to restore their confidence in our examination system and for the exams that remain left to take.”