【Product Contents】 This is a set of the main texts (55 Masters) used in Yotsuya Gakuin's unique 55-step learning system. It includes the subjects necessary for science students and common test preparation. ● Set Contents (12 books total): Mathematics I A II B (Main book & Answer key) Mathematics III (Main book & Answer key) Physics Vol. 1 & 2 (2 main books & 1 answer key) Geography (Main book & Answer key) Listening Workbook (Main book & Answer key) Center Physics Preparation 【Product Condition & Notes】 Year: Approximately 6 years old. Writing: Some pages have date entries and highlighting with fluorescent markers. The key learning points are marked, but please refrain from purchasing if you are concerned. Name: The name sections on the back cover, etc., have been blacked out with a marker for privacy protection. 【Post-it Notes】 Post-it notes are attached to pages with writing. They are left on to easily identify pages with writing (dates and markers), and will be sent as is. If you do not need them, please remove them yourself. Other: There are some scratches and stains on the covers of Mathematics I A II B, etc., but there is no problem with reading the contents. 【Shipping & Other】 Due to the large number of books and their weight, they will be carefully packed in a cardboard box and delivered via Mercari delivery (anonymous shipping). Water damage prevention measures will be thoroughly implemented. Immediate purchase is OK. We are not currently considering selling individual items. We hope this will be helpful for those who want to prepare before attending the school or want to study the 55-step curriculum on their own. #YotsuyaGakuin #55steps #UniversityEntranceExam #Mathematics #Physics #Geography #CommonTest #55Master #ReferenceBookSet