Ohmsha Water Supply Systems Chief Engineer Exam This is a textbook designed for memorization, featuring practice questions in order of frequency, with key points highlighted in red, and explanations. It summarizes the key points in an easy-to-understand manner so that even beginners can study independently, but it's not meant for a quick review right before the exam... There are no discounts, but if you purchase other products totaling over 10,000 yen and would like this book, I will give it to you for free. You will be responsible for the shipping costs. ◎ All items are used and sold "as is." We do not accept returns or complaints after shipping, so please understand this before bidding. If you are concerned, please do not bid.