【Product Description】 ・This is a problem set for those taking the "Concrete Engineer" exam established by the Japan Concrete Institute. ・Problems and answers from the 3rd year of Reiwa (2021) ・Categorized problems, explanations, and answers from Heisei 29 (2017) to Reiwa 3 (2021) ・All problems and answers from Heisei 24 (2012) to Heisei 28 (2016) 【Condition of the Product】 ・Usage status: 　No writing. 　Purchased new and used. 　There are no noticeable stains or discoloration, and I think it's in good condition. 　No smokers or pets. Please ask if you have any other questions. Thank you very much.