Arne Duncan, releasing a report on the Department of Education's latest examination of how well American children are doing in mathematics, said no one should be satisfied with what it found.

CNN: Report card shows U.S. students need to improve math skills

Those who wanted an examination were more likely to have finished education at 16 and to feel worried about their health.

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One reason for the relatively large high school completion rate is that the United States offers a number of "second chances" for students to obtain a high school diploma, including attendance at special school-based programs and obtaining a General Education Credential (GED) credential, usually by passing a high school equivalency examination.

UNESCO: II Part Analytic Section