Fascinating and serious essay by Hess in National Affairs: Our Achievement-Gap Mania. One quote:
Because of the way "achievement gaps" are measured — using scores on standardized reading and math tests — any effort to "close the achievement gap" must necessarily focus on instruction in reading and math. Hence many schools, particularly those at risk of getting failing grades under NCLB, have fixated on reading and math exclusively; other subjects — art and music, foreign language, history, even science — have been set aside to make more time and resources available for remedial instruction. The New York Times has reported that, in Sacramento, California, poorly performing students are permitted to enroll only in math, reading, and gym, in a mad dash to help close the achievement gap. The Wall Street Journal has reported that, facing budget pressures and a relentless press to drive up reading and math scores among the least proficient students, school districts nationwide are axing foreign-language instruction. Indeed, according to the Center for Applied Linguistics, between 1997 and 2008, the share of U.S. elementary schools offering foreign-language classes fell by roughly one-fifth.
There will always be achievement gaps until 1+1=2 is the math test and "See Spot run" is the literature exam. Humans are far too variable in interests, talents, abilities, self-discipline, and motivation for it to ever be otherwise.
As somebody recently commented, "Why not aim for equality in violin, film-making, dress-design, tomato-growing, or basketball?"