High school students with views of green or natural landscapes showed consistently higher standardized test scores and graduation rates, with fewer occurences of criminal behavior. This 2010 study focused on 101 public high schools in southeastern Michigan, with analyses accounting for size of school enrollment, building age, and student background.
Matusoka, Rodney H. (2010). Student Performance and High School Landscapes: Examining the Links. Landscape and Urban Planning 97, 4: 273-282.