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California Contractor Exam Study Guides
Pass your California contractor exam the first time.
Choose your California contractor trade exam, study it in English or Spanish, and bundle it with Law & Business when you need both. Every package includes deep-dive lessons, flash cards, practice tests, and full-length practice exams.
Instant digital delivery · Lifetime access · Works on any device, no install
1,100+
Flash Cards
1,600+
Practice Questions
8
Full-Length Exams
4
Complete Study Guides
Everything you need, nothing you don't
Study guides built like a tutor explaining it to you, not a wall of bullet points to memorize.
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In-Depth Study Guides
Every topic explained the way a tutor would explain it — worked examples, exam-trap callouts, and the numbers that actually get tested.
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Flash Cards
Hundreds of cards organized by section so you can drill exactly the topic you're weakest on, or run the full deck front to back.
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Practice Tests
Filterable by category, instant feedback, flag-and-review workflow — built for repeat use as you close knowledge gaps.
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Full-Length Practice Exams
Hard, CSLB-style questions with tricky near-identical answer choices, simulating real test day.
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English & Español
Switch the study system between English and Spanish. Light and dark display modes are included too.
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General Application Guidance
When you are ready, contact our support team for general application guidance informed by firsthand California contractor experience.
Choose your license track
Law & Business is the common exam. Pick the trade classification you're pursuing now, then choose trade-only or bundle pricing below.
More C-classification study guides can be added to this catalog without changing the buying flow.
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Created by people who understand contracting firsthand
GC Preps is made and owned by Echo Consulting dba Quick Operator. The owner is a licensed California B-General contractor associated with Evercrest Builders Inc. You can verify CSLB license #1161372 and view real construction work on the Evercrest Builders website.
Try it before you buy
A quick look at the style and topics covered — not the actual test bank. The full guides go much deeper, with focused lessons, flash cards, practice questions, and full-length exams.
Tap a card to reveal the answer.
Framing & Structural
What's the standard on-center spacing for wall studs in most CA residential framing?
16 inches on-center is standard (24" is used in some engineered designs).
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Core Trades
What does the abbreviation "PEX" refer to in modern plumbing?
Cross-linked polyethylene — a flexible piping material widely used for water supply lines.
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Concrete & Earthwork
About how long does poured concrete need to cure before reaching full design strength?
About 28 days, though it can often bear light loads within about a week depending on the mix.
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Sample Practice Question
A contractor is estimating a job that involves pouring a new concrete slab. Which of the following has the most direct effect on how thick the slab needs to be?
Slab thickness is primarily driven by the load it needs to support — vehicle traffic, foundation walls, and so on — not by finish, brand, or season. The full B General guide covers load calculations like this in depth.
Tap a card to reveal the answer.
Contracts
In California, when is a home improvement contract legally required to be in writing?
Any home improvement contract over $500 must be in writing and include specific disclosures, like the contractor's license number and a right-to-cancel notice.
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Employment
After how many hours in a single workday does California generally require overtime pay?
After 8 hours in a workday (or 40 in a workweek), at 1.5x the regular rate.
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Business Org & Legal
What's the general purpose of a contractor's license bond?
It protects consumers and the state by providing a source of recovery if a contractor violates licensing law.
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Sample Practice Question
A contractor buys materials for $1,000 and sells the completed job for $1,300. Which pricing concept describes that $300 as a percentage of the selling price rather than the cost?
Margin measures profit as a percentage of the selling price. Markup measures it as a percentage of the cost — mixing the two up is one of the most common exam traps, and the full Law & Business guide breaks it down with worked examples.
A sample of the plain-language C-10 teaching style. Tap a card to reveal the answer.
Electrical Theory
If a 24-ohm load is connected to 120 volts, how much current flows?
5 amps. Use Ohm's Law: I = V ÷ R = 120 ÷ 24 = 5 A.
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Grounding & Bonding
Why are metal electrical enclosures bonded?
To create an effective low-impedance fault-current path so the protective device can open quickly if a hot conductor faults to metal.
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Safety
What does “live-dead-live” mean when checking for absence of voltage?
Prove the tester on a known live source, test the target circuit, then prove the tester again on a known live source.
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Sample Practice Question
A continuous EV charging load is 32 amps. What minimum circuit ampacity does the 125% sizing concept produce?
32 A × 1.25 = 40 A. The full C-10 system explains the calculation first, then connects it to the exam/code concept.
A sample of the plain-language C-39 roofing teaching style. Tap a card to reveal the answer.
Roofing Math
How many square feet are in one roofing square?
100 square feet. Divide roof surface area by 100 to convert square feet to roofing squares.
Tap to reveal →
Steep-Slope Flashing
What flashing is commonly interwoven with shingle courses where a roof meets a sidewall?
Step flashing. Each piece works with a shingle course so water is directed back onto the roof surface.
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Safety
On current California residential-type roofing from 0:12 through 7:12, what fall distance triggers fall protection?
6 feet or more above the grade or level below under the current roofing-specific rule.
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Sample Practice Question
A flat roof measures 20 ft by 50 ft. How many roofing squares are required before adding waste?
20 × 50 = 1,000 square feet. One roofing square = 100 square feet, so 1,000 ÷ 100 = 10 squares before waste.
Why contractors choose GC Preps
No fine print, no expiration clock, no surprises at checkout.
| GC Preps | Many Other Prep Courses | |
|---|---|---|
| Access | Lifetime access — study on your schedule | Often a 60–120 day access window that expires before you're ready |
| Pricing | One flat, upfront price — what you see is what you pay | Base price, then add-ons and upgrade pitches pile on at checkout |
| Support | A direct phone number to the owner, personally | A generic support inbox, or no direct contact at all |
| Who built it | Echo Consulting dba Quick Operator, led by a licensed CA B-General contractor | Anonymous test-prep publishers with no license to check |
| Guarantee | 7-day satisfaction guarantee, no questions asked | Varies widely — often no refund policy at all |
Choose your trade. Pick your package.
Every trade guide is $199.99 by itself. Bundle your trade guide with Law & Business for $249.99 — the best value.
Trade Study Guide
Just your trade exam
$199.99
one-time purchase · instant download
🔒 Secure checkout · Instant delivery
Best Value
Complete Study System
Trade + Law & Business
Save $50 vs. buying separately
$249.99
one-time purchase · instant download
🔒 Secure checkout · Instant delivery
📋 Only need Law & Business?
Get the complete Law & Business study guide, flash cards, practice tests, and full-length exams by itself.
Get Law & Business Only →$99.99
All current study guides include English / Español, lifetime access, and future guide updates. More trade classifications will appear in the same selector as they are released.
🔒 7-day satisfaction guarantee — not right for you, email us within 7 days for a refund.
Questions
How is this delivered?
Right after purchase you'll land on a download page with the study guide or guides included in your package. Save the HTML file(s) and open them in your browser — no account or installation is required for the study system itself.
Which package should I choose?
Choose the trade classification you're testing for. If you also need Law & Business, the $249.99 bundle includes both and saves $50 compared with buying the two guides separately.
Can I buy Law & Business by itself?
Yes. Law & Business is $99.99 on its own. After purchase, you can add an available trade guide for $150 so your total still equals the $249.99 bundle price.
Are the guides available in Spanish?
Yes. The current B General, C-10 Electrical, Law & Business, and B General + Law & Business systems include an English / Español selector. Spanish translation requires an internet connection when switching languages.
What happens right after I buy?
You'll land on a secure download page immediately. For product or general application questions, you can reach us at support@quickoperator.com.
What if it's not right for me?
We offer a 7-day satisfaction guarantee — if the guide isn't a good fit, email support@quickoperator.com within 7 days of purchase for a refund.
Is this affiliated with or endorsed by CSLB?
No. GC Preps is an independent educational product and is not produced, reviewed, or endorsed by CSLB.
What if a new C classification is added to GC Preps?
The storefront is built as a trade catalog. New study guides can be added to the same trade selector without changing how bundles work.