Montgomery County saw some of the sharpest declines

...Montgomery County saw some of the sharpest declines, including a 12 percent drop in the number of students who passed the state’s third-grade math exam. The county’s overall passing test scores for elementary math and reading fell four percentage points overall — to 87 percent — the lowest scores Montgomery has seen in the past six years of testing...

...Montgomery middle schoolers dropped 1 percentage point while Prince George’s middle schoolers held steady, with 68 percent passing, second-lowest in the state...

...In Montgomery County students scoring proficient or better in reading dropped for all elementary and middle school grades, except for seventh and eighth grade, similar to the changes statewide. Math scores in the county fell across the board, also similar to statewide trends...

http://www.washingtonpost.com/local/education/state-test-scores-drop-as-maryland-schools-prepare-for-common-core/2013/07/23/b8e10a8a-f312-11e2-8505-bf6f231e77b4_story_1.html