This is a set of the 4STEP series problem book and answer key, helpful for studying mathematics. Although it is new and unused, there is a fold from storage (see photo 4). Please refrain from purchasing if you are concerned about minor details. - Publisher: Suken Shuppan - Number of pages: Problem book 166 pages, Answer key 197 pages Thank you for viewing. I hope this will be helpful for your exam preparation. Please consider purchasing.