A 5-book set of basic math problems from SAPIX Basic. We do not plan to sell them individually. List price: ¥4,400 (tax included) Composed of three parts: Approach, Step, and Challenge. Condition: There are signs of erased writing, some dirt, and tanning. Recommended for those who plan to copy the pages. Please check the photos for any areas of concern. Details are as follows: 1. Ratios: Signs of correction fluid used to erase red circles. 2. Proportions: No writing. 3. Speed: Signs of erased writing on about 18 pages. 4. Plane Geometry 1: Signs of erased writing on about 1 page. 5. Plane Geometry 2: No writing. We will sell to those who understand that this is a used item. ☆Free Shipping & Immediate Purchase OK☆ Simple packaging Anonymous shipping (Rakuraku or Yuu-Yuu Mercari便) Please also read our profile.