All of these capitals, however, have balked at agreeing to similarly rigorous terms, citing both economic and security reasons, according to U.S. officials who have taken part in the negotiations.

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Only about half of the 744, 000 who registered would have been required to pass the new test, however, since lawyers, CPAs and Enrolled Agents (who have already passed a more rigorous IRS test), were exempt from it.

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However, the education secretary will insist that his overall approach lives on ie "more rigorous" end-of-year exams will replace continuous modular assessment, and school league tables will depend in future on how pupils do in 8 core subjects not, as some Conservatives believe, on how many kids passed the re-sit of their macrame module.

BBC: Michael Gove on exams: U-turn or tweak?