For the last 20 years, these scores have not risen above 428.
The scores rose for two years before dropping this year, he said.
At the year's end, his score had risen to 25.
Average scores on tests required to attend business schools also rose.
The reason the gap did not narrow is only that white scores rose even more.
The study found that grades and reading scores rose with the amount of time spent online.
Yet average black scores have risen while the share of the age group taking tests has also grown.
Scores there rose 46.7 percentage points, to 83.4 percent of students meeting state literacy standards.
The scores rose above the line on either side.
But when students with learning or behavioral problems are excluded, the scores rise for public schools.