The 6th edition features a revision and reorganization of the Review Material from the 5th edition. The book contains approximately 640 pages of material and includes 4 complete and new, simulated sample AP exams. All the new exam questions correlate with the College Board's changed curriculum for the 2015 AP U.S. History Exam. The book contains 730 new, document-based multiple-choice questions, 16 short answer questions, 4 long essays, and 4 document-based questions (DBQ's).