I am selling this item because I passed the exam. There may be some pencil markings that I missed erasing. I used it for a month, so it's not very dirty. This is a problem book specifically for the Marine Engineer exam, containing 6N multiple-choice questions. - Title: Marine Engineer 6N Select Problem Collection - Author: Hiroyuki Wagu - Publisher: Kaibundo - Price: 3000 yen Thank you for looking.