The OCR examination board says students taking GCSEs this year had the same chance of getting the same grade as last year.
OCR's Chief Executive Mark Dawe says the results for 16-year-olds are relatively stable but the overall picture is being affected by younger pupils taking exams early.
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Showers this evening, dying out overnight.
The Bishop of Norwich has called for unity and calm in the wake of the referendum vote to leave the European Union.
Showers becoming heavy this afternoon, with thunder possible.