Head teachers' leader Brian Lightman said that so far there had been a "completely inadequate response".
Mr Lightman said that head teachers and other supporters are "determined to proceed to legal action".
Mr Lightman agreed there was a danger that some qualifications might be seen as better than others.
Brian Lightman, general secretary of the Association of School and College Leaders, cautioned against the over-simplified use of school performance data.
Brian Lightman, leader of the Association of School and College Leaders (ASCL), emphasised the lack of enthusiasm for localised pay negotiations.
Brian Lightman, General Secretary of the Association of School and College Leaders, welcomed the pledge to involve teaching practitioners in the inquiry.
Brian Lightman, general secretary of the Association of School and College leaders said that repeatedly changing the exam system was "unproductive and unhelpful".
"No head teacher takes the decision to close their school lightly, " said Brian Lightman, head of the Association of School and College Leaders.
Mr Lightman said his union had received 800 responses to its survey and 87% of these had reported problems with English GCSE results.
Brian Lightman, general secretary of the Association of School and College Leaders (ASCL), said the statistics should encourage people to "ask more probing questions".
Mr Lightman says "the administration of that examination led to grossly unfair treatment of young people with potentially disastrous effects on their career opportunities".
Brian Lightman, general secretary of the ASCL head teachers' union, described the move to a voluntary qualification as detrimental to raising the status of heads.
"Schools and college leaders have been very clear in their wish to retain a national system of pay and conditions for teachers, " said Mr Lightman.
Head teachers' leader Brian Lightman, who has campaigned over GCSE English grades, says it shows trust in the exam system is at an "all time low".
In an open letter to the chairman of the Commons Education Committee Graham Stuart, Mr Lightman said a "gross injustice" had been done to many young people.
His work had immediate results, but despite acknowledging this Ofsted inspectors who arrived within two months of his starting put the school into special measures, said Mr Lightman.
General secretary of the Association of School and College leaders, Brian Lightman, said he welcomed any move to give vocational qualifications the same status as other academic subjects.
Brian Lightman, general secretary of the Association of School and College Leaders, said GCSEs needed to be reviewed but bringing back an O-level style exam was not the answer.
"A-levels are a well known and well respected international brand and it would be foolish to damage confidence in them for no compelling reason, " said ASCL leader Brian Lightman.
Professor Stafford Lightman, Director of the Henry Wellcome Laboratories for Integrative Neuroscience and Endocrinology at the University of Bristol, said the findings could be interpreted in a different way.
Brian Lightman, general secretary of the Association of School and College Leaders, attacked the report as "simplistic" and being built on "false assertions" about levels of spending received by schools.
Mr Lightman, general secretary of the Association of School and College Leaders, said he had never heard of such a problem and doubted whether schools would behave in this way.
Mr Lightman, general secretary of the Association of School and College Leaders, said the rise in challenges to results was "no surprise" after the unresolved dispute over GCSE English grades.
Head teachers have claimed that grades were manipulated downwards unfairly - and Mr Lightman said the high numbers of grades now being changed after re-marks confirmed the doubts of head teachers.
Mr Lightman also expressed concern that public sector pay rises would be capped at 1% for two years, saying this would make it difficult to attract high calibre candidates into teaching.
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Brian Lightman, of the Association of School and College Leaders (ASCL), whose annual conference opens on Friday, suggested that some schools might decide simply to do three A-levels and ignore AS-levels altogether.
The union's general secretary Brian Lightman has said ministers ought to be cautious about the message they send to young people who are not taking these subjects but who have worked hard.
Speaking to the BBC after his meeting with the watchdog, Brian Lightman, general secretary of ASCL, said the issue was not re-marking papers, but altering grade boundaries and "putting right what's happened".
Association of School and College Leaders general secretary Brian Lightman has predicted an increase in the number of schools who fail to meet their target of 40% of pupils obtaining five good GCSEs.
Association of School and College Leaders general secretary Brian Lightman said the report showed the importance of "ensuring that all young people are properly informed about the range of career routes open to them".
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