Average composite scores on the exam, which measures students' readiness for college-level work, rose to 21.1 from 20.9 last year. Both boys and girls posted gains, as did all racial groups except Hispanics, whose scores held steady. ACT scores range from 1 to 36. Officials at the independent, nonprofit ACT said an increase of 0.2 points is significant when considered across a record 1.2 million test-takers nationwide, or 40 percent of graduating seniors. "It takes an enormous amount of change for that large a group to move even a little bit, particularly when that group is changing and we're seeing...