Schools preparing to receive their GCSE results today have been told to expect "variable" grades.
There are particular concerns among some headteachers about English and maths grades, according to initial reports.
The potentially unpredictable results are said to be due to significant alterations to the qualifications this year.
Brian Lightman, general secretary of the Association of School and College Leaders, which represents a large proportion of secondary heads, said: "We are getting some individual reports of volatility, but we don't know about overall trends yet.
"Some schools have seen surprises. Some schools have seen results which are lower than expected."
More top news
A giant panda has been caught in camera breaking iron bars and moving into the other cell to have a taste of milk in the next cell.
City traders are paying up to £200 to cure their hangovers with a vitamin drip, according to a doctor from Surrey.
Serena Williams won her sixth Australian Open title with a hard fought 6-3, 7-6 (7-5) victory over Maria Sharapova in Melbourne