Some 180 students are part of an alliance that will today launch legal action over the changes to grade boundaries in English GCSEs.
More than 100 schools, 36 councils and seven professional bodies have formed the alliance to take legal action against regulators Ofqual, and exam bodies AQA and Edexcel.
They are calling for exam papers taken in June this year to be remarked, within the same boundaries as those taken in January.
More top news
Gary Barlow performed an impromptu gig in a busy shopping centre.
Stephen Hawking said a Brexit would make Britain more "isolated and insular".
Michael Gove and Boris Johnson are increasingly behaving like an opposition party at a general election.