The College Board released the free response questions from almost every year. My (completely unofficial) solutions to selected years are below.

The College Board also publicly released the complete multiple choice for the 2004 and 2009 AP CS Exams. My solutions are below.

The 2014 AP CS A Course Description included 25 high quality multiple choice quesitons. A link to the old course description, and my unofficial explanations for the MC, are below.