Supervised by the Tokyo Chamber of Commerce and Industry Official Textbook 10th Edition Compatible Price: ¥2420 This is a collection of practice questions for five exams. The app has been used, so it cannot be transferred due to usage rights; only the book is available. I think clearing past exam questions is effective for this certification exam. I recommend studying with this book. The practice videos released on YouTube are also helpful, but I felt a little uneasy with just those, so I bought this question collection and studied. The answers include the corresponding pages in the official textbook, which was convenient for checking.