BOSTON (CBS) — After withholding the spring 10th grade MCAS math scores for about a month while investigating anomalies in their test results, state education officials have validated English High School’s scores.

Mitchell Chester, Massachusetts’ commissioner of K-12 schools, says no evidence was found to invalidate them so they are being released. He congratulated the Boston school on its strong gains and academic achievement.

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Headmaster Ligia Noriega-Murphy says it’s the collaboration of the teachers and students.

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“We have been working very hard and very strategically since the beginning of the school year last year, trying to make sure that our students are prepared not only for MCAS but also for college,” she told WBZ NewsRadio 1030’s Don Huff on Tuesday.

English High had been one of Boston’s most under performing schools for many years.

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WBZ NewsRadio 1030’s Don Huff reports