CSLB Concrete (C-8) Trade Examination — Questions: Not published by CSLB · 210 minutes · Passing score: Not published by CSLB. PrepPass also publishes a complete study guide for this exam as a downloadable book (238 pages, 238 practice questions inside, $24.99).
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The same 100 questions, dealt five ways. Pick the one that fits the time you have.
Learn what the questions test
Practice finds the gaps. Reading closes them. The five chapters below are free to read online. The study guide book is a separate download, sold on its own page.
Before you sit
See the questions first
Real items, with the answer marked and the reason written out — the same format as all 100.
A shed slab is 16 ft by 20 ft and 4 in thick. How much concrete does it contain?
Why: 16 × 20 = 320 sq ft; 4 in = 0.333 ft; 320 × 0.333 = 106.7 cu ft; ÷ 27 = 4.0 cu yd. Dividing by 9 gives 11.9, and multiplying by 4 without converting inches gives 47.4.NIST Handbook 44 (2026), Appendix C
Proof-rolling reveals a soft, rutting area in a slab subgrade. What should be done?
Why: A uniform foundation matters more than a strong one, and there should be no hard or soft spots. A soft area left in place becomes a crack line; it is removed or reworked and recompacted.IMCP Manual for Concrete Pavement, 2nd ed. (FHWA/CP Tech Center, 2019)
The exam itself
| Questions | Not published by CSLBCSLB says only that “All trade examinations consist of multiple-choice questions.” No count appears in the study guide, the Examinations FAQ, or PSI's candidate bulletin. |
|---|---|
| Time | 210 minutesCSLB: “You will be given 3-1/2 hours to complete each examination.” It is per examination, not per sitting — a candidate taking Law and Business plus a trade exam gets 3-1/2 hours for each. |
| Sections | Planning and Estimating · Pre-placement Preparation · Placing and Finishing · Post-placement Tasks · Safety |
| Passing score | Not published by CSLBCSLB: “You will be informed at the test site about the percentage of correct answers needed to pass each examination,” and, in Get Licensed to Build Q14, that the percentage “varies for each exam”. Passing candidates are never shown their own score. PrepPass states no passing score for this exam. |
| Our bank | 100 questions · updated September 2026Written from California Contractors State License Board (CSLB) |
| Languages | English |
| Source | California Contractors State License Board (CSLB)Verified 2026-09-24 |
Contractor License Exams
Studying for the CSLB C-8 Concrete in order? CSLB C-8 Concrete Trade Exam Study Guide (2026) — PDF + EPUB, $24.99 · 14-day refund →
Questions
All 100 questions, the timed mock and the report are free with no sign-up. A free account only adds saving your progress. The study guide book is sold separately, $24.99 one-time; nothing in the practice requires it.
No. Ours is 100 questions in 210 minutes; the real exam is 210 minutes long. Use the mock for stamina and section timing, not as a score predictor.
Not published by CSLB — as published by California Contractors State License Board (CSLB). Confirm the current rule with them before your exam date.
Yes. PrepPass sells CSLB C-8 Concrete Trade Exam Study Guide (2026), a PDF + EPUB download, $24.99 one-time; the practice on this page stays free without it. See the study guide →