Returning from spring vacation, Dowan McNair-Lee's students find their desks in neat rows, facing forward. For the previous seven months, the 8th graders had sat in clusters, facing one another, to facilitate discussion. But janitors used the break to ready the classroom for the year-end tests that are only two weeks away. The new arrangement is…

The task seemed straightforward enough: Students taking part in a recent international test were asked to review drawings of five triangles with varying angles and midpoints. Then those teenagers were to read over a paragraph describing the characteristics of a particular triangle and, finally, choose the triangle that fit the description. Of the…