High school students are increasingly taking college courses—but little is known about whether it will benefit them.

High school students are increasingly taking college courses—but little is known about whether it will benefit them. Thanks to dual-enrollment programs, which are expanding rapidly, students can get a head start on college credits, cutting down on the cost of higher education. Some also argue that Advanced Placement courses are more rigorous, and worthier of students’ extra effort. However, the impacts of programs on “a diverse set of students” is not yet known. (WSJ)