勉強しやすい
隙間時間に出来て良い
いいですね
勉強になります
iPhone12promax
とても使いやすかったです！
使いやすい
アプリで勉強できるのがいい
見やすいです
カラーでとても見やすいです。
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About
This app helps you prepare for the Class 4 Hazardous Materials Handler exam. It offers practice questions with detailed explanations, a test mode to identify weak areas, and review features for incorrect or bookmarked questions. Study efficiently in your spare time to achieve exam success.
✓Practice questions with detailed explanations
✓Test mode to identify weak areas
✓Review incorrect questions
✓Bookmark important questions
✓Level-based and topic-based learning
✓Timer and text size adjustment
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What's New in 乙4（危険物取扱者 乙種４類）｜資格試験合格アプリ
1.1
July 29, 2026
軽微な修正を修正いたしました。
1
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$2.99
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FAQ
Does 乙4 have ads?
Yes, 乙4 contains advertisements. This allows the app to remain free for users while offering premium features through in-app purchases.
What is the price of 乙4?
乙4 is available for free. Additional practice questions can be purchased through in-app purchases to enhance your learning experience and potentially improve your pass rate.
What devices does 乙4 support?
乙4 is compatible with iPhone, iPad, and iPod devices, making it accessible for a wide range of iOS users.
How often is 乙4 updated?
The latest version of 乙4 is 1.1, which was last updated on July 29, 2026. While specific update frequency isn't detailed, the app is actively maintained.
Can I reset my learning progress in 乙4?
Yes, 乙4 offers a learning reset function in its settings. This allows you to delete all your learning history if you wish to start fresh.
What is the age rating for 乙4?
乙4 has an age rating of 4+. This indicates it is suitable for a broad audience, though its content is specifically tailored for exam preparation.
How does 乙4 handle potential errors in questions due to legal changes?
The app acknowledges that due to the nature of past exam questions, errors may arise from legal revisions. Users are encouraged to contact the developers via the inquiry section if they find any discrepancies.
Can I adjust the text size in 乙4?
Yes, 乙4 allows you to change the text size to 'small', 'medium', or 'large' through the settings screen for a more comfortable reading experience.