"Things are so much quieter now, " said Rogelio Vallesteros, who runs a Spanish-language school in Oaxaca City.

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"Too often what we have been doing is using these tests to punish students or to, in some cases, punish schools, " the president told students and parents at a town hall hosted by the Univision Spanish-language television network at Bell Multicultural High School in Washington, D.

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