The number of pupils who achieved five or more A*-C grades including English and maths dropped from 81.2% in 2011 to 69.7% this year - The Holt's first year as an academy.
A report from exams watchdog OFQUAL is due today, with teaching unions saying exams marked last January were marked more leniently than those in June.
Miss Richards - who said the use of different exam boards might explain the differing fortunes of schools in GCSEs- said: "It is just awful; these are children's lives they are playing with. It would appear the boundaries have moved by 10%."
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