Observed arrival · 2026-09-12
危険物スタディ: a Japanese hazardous-materials exam drill
A Japanese study platform for the 乙種第4類 hazardous-materials certification, with hundreds of questions, explanations, reference lessons, and practice tests.
Field notes
The homepage organizes preparation into question practice, reference reading, error review, and calculation work. Its 乙種第4類 track lists 508 targeted questions across law, physics and chemistry, properties and extinguishing, and basic classification, alongside 13 short reference themes. A five-question diagnostic is described as taking about three minutes without registration, while a 35-question drill uses a 15/10/10 subject split. The planned premium mock exam contains 175 answer choices, but is still undergoing content review.
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