Are students enrolled in Advanced Placement courses really tackling college-level material? That question is the focus of an audit by the College Board, which owns the AP label. College admissions officers consider AP coursework an indicator that students have challenged themselves in high schoolbut they seem increasingly uncertain about how much weight to give such classes. Now, all educators who want to use the AP tag must turn in a syllabus and course audit form by June 1. The College Board will decide by November which classes make the grade and post a list of authorized courses on its Web site.