FILE - In this Feb. 20, 2013, file photo fifth-grader Daniel Slotten reads for comprehension during an exam that reflects new literacy standards for the Common Core initiative at a Westview Elementary School class in Apple Valley, Minn. Some states are pushing back against the new set of uniform benchmarks for reading, writing and math that replace a hodgepodge of of goals that had varied wildly from state to state and are being widely implemented this school year in most states. (AP Photo/The St. Paul Pioneer Press, John Doman, File) MINNEAPOLIS STAR TRIBUNE OUT

Associated Press
FILE - In this Feb. 20, 2013, file photo fifth-grader Daniel Slotten reads for comprehension during an exam that reflects new literacy standards for the Common Core initiative at a Westview Elementary School class in Apple Valley, Minn. Some states are pushing back against the new set of uniform benchmarks for reading, writing and math that replace a hodgepodge of of goals that had varied wildly from state to state and are being widely implemented this school year in most states. (AP Photo/The St. Paul Pioneer Press, John Doman, File) MINNEAPOLIS STAR TRIBUNE OUT
FILE - In this Feb. 20, 2013, file photo fifth-grader Daniel Slotten reads for comprehension during an exam that reflects new literacy standards for the Common Core initiative at a Westview Elementary School class in Apple Valley, Minn. Some states are pushing back against the new set of uniform benchmarks for reading, writing and math that replace a hodgepodge of of goals that had varied wildly from state to state and are being widely implemented this school year in most states. (AP Photo/The St. Paul Pioneer Press, John Doman, File) MINNEAPOLIS STAR TRIBUNE OUT
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