In a report in The Guardian newspaper, Whitehall sources accuse the Welsh government of being "determined to keep dumbing down" exam standards.
He said the Tories' proposal was a positive idea, but providing exam papers on their own would not answer critics of exam standards.
But the head of Wales' biggest exam board said standards should be shared.
This had resulted in an unclear definition of standards, giving exam boards too much leeway, the inquiry found.
Two years ago, the group said it would join education publisher Pearson PLC to overhaul the exam, align it with new academic standards and make it completely digital.
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The QCA will be scrutinising exam papers and candidates' scripts this year more than ever in the effort to try to ensure that standards are maintained - but says it does not intervene with the exam boards to tell them where to fix the boundaries between grades.
"We do not think that research based on tests in a small number of specific topics taken in 11 schools by 11 to 14-year-olds is a good way to judge standards in the maths GCSE - an exam which tests the full breadth of the curriculum and that is taken by older pupils from all schools in the country, " she said.
Seattle teachers complain the exam isn't linked to district or state learning standards.
We've got to get in to the (interjection) the vast majority of secondary schools in places like this city, we need to improve standards, we need to introduce rigor in to the exam system.
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An important one is Certified Financial Planner, a designation awarded by the CFP Board of Standards in Denver after classes, some work experience, an exam and a pledge to abide by a code of ethics.
Attorneys and CPAs are exempt both from the competency exam and the mandatory continuing education requirements on the grounds that their respective professions already have standards that exceed those of the IRS. As a tax attorney, I agree that this makes a little bit of sense.
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The first exam results to be announced this summer will be in Scotland, where the results of Highers and Standards will be received by students on Tuesday.
He said medical schools are turning away hundreds upon hundreds of candidates "who meet all the standards, who are scoring in the 90th percentile" on the medical-school entrance exam.
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