Video. A leading head teacher, who has embraced many of the government's new education policies, is criticising the Education Secretary over last minute changes to rules over GCSE exams.
Simon Spiers, of King Alfred's Academy at Wantage in Oxfordshire, has written a scathing letter to Michael Gove. He says the changes will cause chaos and affect his school's results - and has hit back at claims that schools are "gaming" the exam system.
But the government says the changes are in the best interests of students.
Christine Alsford has this exclusive report.