Applying that here, scores for most groups of students have improved by roughly a full grade level over the last 15 years or so. (educationnext.org)
All of this is made so much more challenging when the state is no longer providing achievement data for most groups of students by most schools. (apluscolorado.org)
Besides the normal gender, religious, ethnic and racial differences typically found in most groups, there's also a wide range of writing styles and genre preferences. (knockinbooks.com)