The High Court is due to rule on an unprecedented legal challenge over GCSE exam grades.
An alliance of hundreds of pupils and schools and scores of local councils, as well as teaching unions, are seeking judicial review.
They are accusing the AQA and Edexcel exam boards of unfairly pushing up the grade boundaries for English last summer in what amounted to "illegitimate grade manipulation" and "a statistical fix" involving exams regulator Ofqual.
Both the boards and Ofqual deny acting unfairly or unlawfully.
Lord Justice Elias and Mrs Justice Sharp will give their judgement at the High Court in London.