A spike in test scores at two schools in the Charlotte, N.C., district has raised questions about why the number of students taking the tests went down, even though enrollment was up. One high school went from a 45% pass rate on state exams last year to 82% this year. School administrators say they just delayed weaker students from taking the tests and are not trying to manipulate performance assessments. District officials contend that schools will not be able to "hide kids" because the tests are a graduation requirement.
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