From the National Superintendents Roundtable:
How High the Bar? is a joint project of the National Superintendents Roundtable and the Horace Mann League. The report sheds light on common school accountability benchmarks in the United States, asking how well students in other nations would perform if they were held to the benchmark of “proficient” in the National Assessment of Educational Progress or to Common Core measures of “career and college readiness.”
You can order a copy of the report from the hot link provided for the Roundtable. It appears there is a cost for either a hard or downloaded copy.