Schools in England can appeal if they can show this year's GCSE and A-level results do not reflect recent improvements, the exams watchdog says.
Ofqual's announcement comes amid concern that the manner in which grades are calculated in the absence of exams could penalise some pupils.
In Scotland there were claims that a similar system marked down poorer pupils more heavily.
Individual pupils will not be able to challenge their grades, however.
Read more in BBC News
Cafcass launches new telephone line for children involved in court proceedings
The government is to increase the funding rate for universal infant free school meals by just 7p a pupil, it was announced on Tuesday, a move immediately branded “inadequate” by the sector.
Infant free school meals funding rises by just 7p a meal in England
The government is to increase the funding rate for universal infant free school meals by just 7p a pupil, it was announced on Tuesday, a move immediately branded “inadequate” by the sector.
Government announces further £5.4 million funding of family mediation voucher scheme
The government has provided a further £5.4 million in funding to help families to resolve disputes such as contact arrangements for children out of court.