In this May 1, 2012 photo, teacher Kayla Morrow, standing at left, teaches an Advanced Placement government class at the Academy for College and Career Exploration in Baltimore. In May 2012, 2 million students will take 3.7 million end-of-year AP exams - figures well over double those from a decade ago. &quot;What AP is really trying to teach you is for a lot of things, there's really not a right and wrong answer. It's, 'how do you get to that?'&quot; Morrow said, adding the AP training improved her teaching in regular classes, too. (AP Photo/Patrick Semansky)