No state has completely pulled out of Common Core, but Utah and Alabama have backed out of the consortium of states working to create computer-based Common Core exams.

WSJ: New School Standards Spur a Backlash

In Kentucky, the first state to replace state exams with tests based on Common Core, the percentage of students meeting math and reading goals dropped by about one-third last year.

WSJ: New School Standards Spur a Backlash

The new GCSE qualifications, for courses starting in the autumn 2015, will be drawn up by exam boards for approval by the exams watchdog, Ofqual, in the core subjects English, maths, the sciences, history and geography.

BBC: GCSE changes to final exams 'will disadvantage girls'

The original plan had been for the first candidates to start courses in 2015 and take the new-look exams two years later, initially in three core subject areas - English, maths and sciences - with an extension later to history, geography and languages.

BBC: Education & Family

Just one month later at Stuyvesant high school, students used cell phones to share test questions and answers on the 2012 Regents exams, a test used by New York State to evaluate core subjects.

FORBES: Is Teaching Collaboration The Catch-22 Of Education?