WASHINGTON (AP) — District of Columbia students’ scores on science tests won’t affect evaluations of their schools’ performance until 2016. That’s after the Obama administration on Friday granted the city a one-year extension of a waiver from portions of a federal education law.

The federal No Child Left Behind law mandates that all students be proficient in reading and math by 2014. But in 2012, Washington, Maryland and Virginia were granted waivers from pieces of the law. Under the original waiver, science tests that students took last spring were supposed to count in determining a school’s rank first time this year. The Washington Post reports (http://wapo.st/1pXUpJz ) that an amendment to the waiver pushes that back until the spring of 2016.

The U.S. Department of Education has granted waivers in 23 states since July.

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Information from: The Washington Post, http://www.washingtonpost.com

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