A headteacher has called for greater transparency for the Government over changes to GCSEs.
Peter Lang from Uxbridge High School said changes to the core subjects, English, maths and sciences, had lead to confusion in education circles.
Mr Lang also told the Gazette that 10 of his students were still awaiting the results of English exams they took in January, and these may not come for another 24 hours.
He said: "It seems that the Government is making changes to the core subjects every year and that makes it very difficult for us as a school to know what to expect.
"There needs to be a proper national debate on GCSEs so that everyone from students, schools and parents knows what is happening and what to expect."
It has been estimated that it is up to 15 per cent harder to get a C grade in English this year compared to last.
Mr Lang, who sits on the executive council of the Association of School and College Leaders which has more than 17,00 0 members, said that changes during the year are unfair on students.
"Between the start of the school year and now changes have been made to the core subjects and they have not been properly explained.
"I am not making excuses and I am delighted with out results, which is down to the hard work done by the staff and students, but we need more clarity from the Government."
Last year a number of schools nationally challenged their English results after students received lower than expected grades.
Mr Lang said the school has got a 75 per cent pass rate of students getting five or more A*-C grades but this could change when the English results arrive.