A year-long, comprehensive reference book to support understanding of first-year junior high school math in a combined junior high and high school program. Shinken Zemi. I was studying with this a year ago. The explanations were detailed and helpful. My child used it, so there are some folds and wear. I don't think there are any writings, but it is a used item. Please understand this before purchasing. - Title: First-Year Junior High School Math Lesson Understanding Support BOOK Year-Long Edition - Compatible with: Red sheet - Contents: Includes school lesson content and digital challenges - Features: Year-long edition, perfect for study support Thank you for viewing.