This is Obunsha's "Standard Problem Mastery: Mathematics II・B + Vectors." It's a problem collection with a strong reputation for preparing students for difficult university entrance exams. It is a new, unused item. I purchased it but did not use it, and it has been stored at home. [Condition of the item] ・Unused ・There may be minor scratches due to storage. ・Everything in the photos is included. Please purchase only if you understand that it has been stored at home.