sentences:  The social stratification caused by the separate lunch lines has attracted some criticism and efforts by the district to improve participation by eligible students.For the spring 2006 administration, 47% of the school's ninth-graders scored "proficient" or above on the statewide standardized English exam, up from 39% from the previous year.Balboa has reached third-highest rating of high schools in the San Francisco Unified District, next to Ruth Asawa San Francisco School of the Arts a Public School as second, and Lowell High School as first, in accordance to Great Schools Rating of administrators, parents, and fellow students.