Posted on May 19, 2015 by Lyndsey Layton in The Washington Post The Washington Post, By Lyndsey Layton The greatest barriers to school success for K-12 students have little to do with anything that goes on in the classroom, according to the nation’s top teachers: It is family stress, followed by poverty, and learning and psychological problems. Those were the factors named in a survey of the 2015 state Teachers of the Year, top educators selected annually in every U.S. state and jurisdictions such as the District of Columbia and Guam.