The Drywall (C-9) Exam: Format, Topics, and Passing Score

The C-9 Drywall exam is a closed-book, four-choice test. The current CSLB guide is the source for its topics and weights, while CSLB provides the required percentage at the test site.

Exam snapshot

Topics and weights

1. Plans, specifications, site readiness, and cost estimates. (18%)

Plans, specifications, site readiness, and cost estimates.

2. Material management, assembly layout, metal framing, and backing. (14%)

Material management, assembly layout, metal framing, and backing.

3. Ceilings, standard and fire-rated board, trims, and repairs. (32%)

Ceilings, standard and fire-rated board, trims, and repairs.

4. Compounds, finish levels, taping, coating, sanding, and texture. (17%)

Compounds, finish levels, taping, coating, sanding, and texture.

5. Personnel, job-site, tools, equipment, and elevated-work safety. (19%)

Personnel, job-site, tools, equipment, and elevated-work safety.

C-9 focus: installation comes before finish quality

Installation and repair account for 32% of the C-9 guide, while finishing accounts for 17%. Study ceiling, standard, fire-rated, and specialty assemblies before spending all your time on compound and texture. The practical sequence is readiness, framing and backing, board installation, then tape, finish level, sanding, and texture.

Study plan

The percentages are approximate, but they are useful for allocating time. Give the largest sections more study sessions, then mark each topic green, yellow, or red after a first pass. Start the next block with the highest-weight red topic. This turns the official guide into a schedule instead of a list you read once.

1. Read the free C-9 Drywall and make a one-page topic map.
2. Review the Peerless Drywall (C-9) Study Guide Book in the same order as the blueprint.
3. Pair trade preparation with the CSLB Law & Business practice exam.
4. Use the Peerless Drywall online practice exam in timed blocks and log every miss.
5. Practice without notes before test day and confirm the current PSI appointment instructions.

How to use practice questions

Keep an error log with three columns: topic, reason for the miss, and the rule or calculation that fixes it. Review lucky guesses too. CSLB keeps exam questions confidential, so preparation should teach the public blueprint and reasoning rather than promise access to live questions.

Frequently asked questions

How many questions are on the C-9 exam?

The current public CSLB trade guide does not give one universal question count for every classification. Use the current Notice to Schedule and PSI instructions for appointment-specific details.

What passing score do I need for the C-9 exam?

CSLB says the percentage of correct answers needed to pass is provided at the examination site. Treat an uncited percentage from an old article as unverified.

Is the C-9 exam open book?

No. The official CSLB C-9 Drywall study guide describes the trade examination as closed book. Practice recalling the rule, calculation, or sequence without a reference open beside you.

Can I use a calculator?

The CSLB guide says some questions require mathematical computation and that a calculator will be provided. Practice setting up the calculation before checking arithmetic.

Are practice questions actual CSLB questions?

No. CSLB says exam questions and answer keys are not available for review. Practice questions should be newly written from the public blueprint.

Sources

• CSLB examination study guides
• CSLB: Studying for the examination
• CSLB examination FAQ
• C-9 Drywall
• CSLB C-9 classification

Peerless Institute has helped people prepare for California contractor exams since 1953. Use the Peerless Drywall Study Guide Book and online practice exam. The California contractor license roadmap and Law & Business guide cover the rest of the application.