I purchased this here the week before last. I am selling it because my exams are over. There are 4 parts, but the 4th part is unused. The other parts have faint writing on the problems, but no answers are written. Includes CD. Played a few weeks ago. 2 answer sheets remain. Answer booklet has been separated. I am also selling other reference books, so I welcome combined purchases. Please feel free to comment. This is a used item and has been stored by an amateur, so please only purchase if you understand this. If you wish to purchase, please read my profile.