This book contains 1000 questions and answers, and its compact size makes it easy to carry on your commute to work or school. When studying, I've checked the answers with a red pen as shown in the photos, but there are basically no other markings. The book itself is in good condition with no tears, and the red sheet is also included. *Regarding the app, the registration deadline is October 18, 2025, so it cannot be used. *Publisher: LEC *List price: 2000 yen (excluding tax)