Md. test scores improving, but researchers unsure why

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More Maryland students are accomplishing the goals of No Child Left Behind, improving reading and math scores, but it is impossible to determine if that law is responsible, a new study shows.

The study, released this week and conducted by the Washington-based Center for Education Policy, is one of the most credible and comprehensive on No Child Left Behind, experts said, studying student achievement in the law?s first six years in every state.

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