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All free study sets

Plumbing journeyman (IPC/UPC)

25 paraphrased IPC/UPC questions with code-family tags and section references.

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NEC journeyman electrical

20 NEC-aligned questions across the four exam domains with article citations.

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EPA 608 refrigerant certification

20-question free-tier set spanning Core, Type I, Type II, and Type III with explanations.

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Plumbing apprentice study guide

Chapter 1 prose + 18 practice questions. Full Part 1 edition (Chapters 1–4) available free by email on the guide page.

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Each set is paraphrased from publicly-available code and exam-prep material. They’re study aids — not the proctored exam, and not a substitute for the in-force code as adopted by your AHJ.