Nearly half of central Ohio district schools got a D or F in overall performance toward making kids proficient on the just-released state report cards. While many of the poorly performing schools are located in inner-city or low-income neighborhoods, several suburban districts - including Dublin, Gahanna-Jefferson, Grandview Heights, Hamilton Local, Hilliard, Reynoldsburg, Westerville and Worthington - have schools getting a D or F in the "indicators met," which measures how many students have a minimum level of knowledge in core subjects.