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WASHINGTON — More than three-quarters of the nation’s public schools could soon be labeled “failing” under the federal No Child Left Behind Act, the Obama administration said Wednesday as it increased efforts to revamp President George W. Bush’s signature education initiative.

The projection from Education Secretary Arne Duncan amounted to a declaration that the school-ratings revolution that Bush began nearly 10 years ago is itself in jeopardy because the law has become unworkable. President Barack Obama is pushing to loosen accountability rules for most schools but crack down harder on the worst.