This is the "D Stage" math textbook for third-year junior high school students, which was used at Daiichi Seminar. It is a set of two books: ・Textbook ・Answer booklet It contains practice problems for high school entrance exam preparation, allowing you to study content at the exam level, such as geometry problems and proof problems. As this is a cram school textbook and not commercially available, it is recommended for those who want to prepare for exams or improve their skills. [Condition] There are no visible writings. There are some minor folds and scuffs due to use, but they do not affect learning. [Contents] Daiichi Seminar D Stage Mathematics 3rd Year Junior High School *Please check the photos for the condition.