Results in key GCSE subjects could fall following the introduction of new rules that penalise pupils for poor spelling, punctuation and grammar.
The number of pupils given A* to C grades may drop after it was revealed that candidates will lose marks for poor standards of literacy for the first time this summer.
The changes – being applied to English literature, history, geography and religious studies – will see five per cent of marks deducted for misspelling words, sloppy sentence structure and poor use of full stops, question marks, commas and apostrophes.