Hazmat Handler Class A (Kou)

Particles and Waves

In-app purchases

About this app

A Japanese-language study app for Japan's Class A Hazardous Materials Handler (甲種危険物取扱者) national exam.

Please note: the interface, the questions and every explanation are in Japanese. Japanese reading ability is required.

■ What it is
450 original questions covering the Class A exam scope. Questions are original work by Particles and Waves, written from the Fire Service Act, related regulations, Fire and Disaster Management Agency materials and the subjects and question counts published by the Fire Service Examination Center. They are not reproductions of past exam papers.

■ Every choice explained
Every choice carries its own explanation, not just the correct one.

■ Mock exams in the real format
A half mock of 22 questions and a full mock of 45 questions. The pass criterion is 60% or more in every subject, and the app shows where you stand subject by subject against that bar.

■ Study plan and weak spots
A daily target counted back from your exam date, a weakness loop for the questions you got wrong, a mode for questions you have not seen yet, and your study history. Just before the exam the app shows a look back at what you have covered.

■ About the qualification
The Class A Hazardous Materials Handler is a national qualification under Japan's Fire Service Act. Holders can handle hazardous materials of every category, 1 to 6. Eligibility, exam dates and application procedures can change; always confirm them on the examining body's official site.

■ Auto-play review
A hands-free mode that shows each answer automatically and moves on. Display time adapts to the length of the text and the pace is adjustable, so you can review when you cannot use your hands.

■ Offline and private
Android 8.0 or later. Questions are bundled in the app, so you can study without a connection. The app goes online only to receive question corrections and to process a purchase. There is no account to create, and your study record stays on the device.

■ What is free
10 drill questions in total, one half mock exam (22 questions), and 3 days of the auto-play review mode. The free allowance does not reset daily. A single in-app purchase unlocks the rest. It is not a subscription, and there are no ads. See the In-app purchases line on this page for the current amount.

■ Report an error, get the fix without waiting for an update
Errors in a question or explanation can be reported anonymously from inside the app. Confirmed corrections are delivered without an app update, and the correction history is published in the app. No personal account information is collected.

■ What is included
・450 original questions
・Study across the three Class A subjects
・An explanation for every choice
・Half mock 22 questions / full mock 45 questions
・Study plan counted back from the exam date, and a weakness loop

Supervised by a holder of the Class A (甲種) Hazardous Materials Handler licence.

■ Sources and relationship to government bodies
・Fire Service Examination Center (消防試験研究センター) https://www.shoubo-shiken.or.jp/kikenbutsu/
・e-Gov law search, Fire Service Act https://laws.e-gov.go.jp/law/323AC1000000186
・Fire and Disaster Management Agency, "What are hazardous materials" https://www.fdma.go.jp/laws/laws/laws003.html

This is an unofficial study app made by Particles and Waves. It is not affiliated with, endorsed by, or representative of the Fire Service Examination Center, the Fire and Disaster Management Agency, or any other government body, and it does not guarantee a pass. Always confirm exam dates, applications and the current rules on the official sites.

English text prepared 2026-09-13 from the Japanese listing, which was verified 2026-09-11 against the shipping app (question counts, free allowance and requirements).

What’s new

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