Walker Kroubalkian said he didn’t pay much mind to an advance placement test he’d taken five months ago. The University High School student took the AP calculus exam in May. He’d hoped for a 5, which ...

REVERE — In high school, Robert Stoica stayed after class for calculus help. Now a freshman at the Massachusetts College of Pharmacy and Health Sciences in Boston, Stoica, 18, said classmates turn to ...