Bluford High Series by Anne Schraff

In grade school, Darcy Wills and Brisana Meeks were friends. But all that changed at Bluford High when Darcy started hanging with "the zeros"--a group of students Brisana despises. Now the former friends are bitter rivals, and the tension between them is getting worse. For a while, Darcy tries to stay calm, ignoring her old friend's daily taunts. But when she learns that Brisana is after her boyfriend, Hakeem Randall, Darcy knows she must do something. But what?