危険物スタディ

Prepare for the Japanese Hazardous Materials Engineer examination with qualification-specific practice, explanations and offline study notes. Choose Class A, Class B categories 1–6, or Class C. FREE STUDY Choose a subject and practice ten questions at a time. Resume unfinished sessions, review mistakes, and track progress on your device. Questions are original learning materials, not official past examination questions. OPTIONAL OTSU-4 PREMIUM The monthly subscription includes three original Otsu-4 mock exams: 105 questions in total, explanations for all 525 answer choices, a 120-minute timer per exam, subject scores, and 35 review cards. It also includes 48 self-check workbook exercises: 32 chemistry exercises across 8 chapters and 16 combustion/fire-extinguishing exercises across 4 chapters, with flow diagrams, comparison tables and worked examples. Workbook exercises are not automatically graded. Paid mock exams for other qualifications are not included. Advertising is currently paused for all users. The price appears in the app and Apple's purchase confirmation. The subscription renews automatically unless cancelled at least 24 hours before the current period ends. Manage or cancel it in Apple account settings. Restore purchases from the Premium screen. Website subscriptions are separate and do not unlock app Premium. No app account or login is required. Study records are stored locally without cross-device synchronization. This independent study aid is not affiliated with the examination organizer. Support: https://kiken-study.com/about/ Privacy: https://kiken-study.com/privacy/ Terms: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/