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Just as gross domestic product (GDP) growth is said to be a good measure of a president’s economic management skills, so the nation’s official report card, the National Assessment of Educational Progress (NAEP), provides an objective indicator of the success a president has had at strengthening the American school. According to this measure, George W. Bush beats Barack Obama by a wide margin. Overall, the annual growth rate in fourth- and eighth-grade math was twice as rapid under the Bush administration as under his successor’s. In reading, the Bush record in fourth grade is infinitely better, as no gains have been recorded under Mr. Obama’s leadership.