Margaret Martin (right) poses with student Jose Correa during a Harmony Project open house at the Ramon C. Cortines School for Visual and Performing Arts in Los Angeles.
Esteban Rael/Harmony Project
One study found that teachers under high-stakes testing spent more time teaching "bubble kids" who were close to passing, at the expense of students elsewhere on the bell curve.
Students are given healthy choices on a lunch line at Draper Middle School in Rotterdam, N.Y., in 2012. Schools across the country have found that students are throwing out the fruits and vegetables they're served.