2025 Edition High-Pressure Gas Sales Supervisor Exam, Second Class Sales: Strategy Problem Collection (Ohmsha) Includes 5 years' worth of past questions. I passed the exam on the first try (after completing it 4 times) with this book alone. *Pass confirmed on 11/10 with the High-Pressure Gas Safety Institute's official answer key. I removed the cover while using it and carried it around. The cover underneath has some dirt and wear. No writing, tears, or folds inside. Please check the condition in the photos. Instant purchase OK, but please read the profile before purchasing. Thank you for viewing.