Students were ranked based on achievement score tests and divided into 3 groups in order to allow each group to learn at their own pace.

The difference in achievement scores was most pronounced in families who were less well-off.

It contains mathematics achievement scores of 7185 students.

Students also exemplified higher test performance, higher standard achievement scores, thinking on levels that require higher order thinking, and more engagement.

They have lower rates of school absenteeism and higher school achievement scores.