As shown in the photos, these are 7 math reference books. I used them for Common Test preparation. The "Introduction to Problems" (Nyumon Mondai Seikou) for 1.A and 2.B have some signs of use, but for 3.C, I only used the vector section. The Green Chart has occasional markings as shown in the third photo. The "Mathematics for Humanities" (Bunkei no Sugaku) Red version has the most signs of use and many written notes as shown in the fourth photo. I used the "Mark Sheet Basic Problems" (Mark-shiki Kiso Mondai Shu) for IA, but 2BC are almost unused. None of the 7 books have any dirt or damage that would hinder learning. Please understand that these are used items.