Principals say they are considering legal action, according to the test controller in order to test boards this summer GCSEs in English denied Regrade.
On Friday confirmed Ofqual grade boundaries had changed from January to June, but has only Resits to the affected students offered later in the year.
A head teachers' union said there was a "systematic error" and many students have been disadvantaged.
Work plans addressed to House Of Commons on Monday.Teaching unions are upset that many students now downgraded the prospect of resitting exams are instead their papers automatically.
They claim that those who had the test in June SA at a disadvantage against the English GCSE had sat earlier in the year, because in the summer tests was marked by sharply over Ofqual exam boards had been told to keep an eye on the grade inflation.
The head teachers' union, the Association of School and College Leaders (ASCL), the Ofqual had urged study, said that it was not a challenge to the decision to order considering a downgrade of the papers.
Many students were expected to score a decisive C a d as a result of changes in the degree limit. This means that some places are denied university.
ASCL general secretary Brian Lightman said that was "a systemic error on the award of GCSE English class.
'Good faith'
He added: make "teachers and students, in good faith, followed advice and feedback from the exhibitors during trade and worked to review the approximate limits given them.
"They accept that rating limits by a few brands may change, but to change of 10 or more a mockery of the system."
Russell Hobby, general secretary of the National Association of Head Teachers, said, "not the gravity of this situation can not be underestimated."
After conducting a review of the issues raised in last week, Ofqual chief executive Glenys Stacey said on Friday that had determined that the June borders had been set correctly and the problem rested with the January standards.
However, she said the papers had been quite marked, and students were able to resit the exams early.
Ms Stacey said auditors had used their best judgment in determining the grade boundaries at any time, but the labeling in January - when only 7% of candidates caused the unit was concerned SA - had less data and information for the work.
Labour said that Ofqual had not addressed the situation of students in the same year, which maintain the same brands, the award with different varieties.
BBC political correspondent Iain Watson says, have the report from Ofqual seems exacerbated rather than suppressed the line.
Education Secretary Michael Gove will be questioned by MPs on Monday and will work to tell him if he crossed that it's fair for students to resit exams believes, for reasons outside their control, our correspondent adds.
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