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Complex. Technical. Challenging.
That's how most people describe the CSLB California Contractor License exams.
We make it simple.
Trusted by Aspiring California Contractors
Complete prep for CSLB Law & Business + C-10 Electrical
Master the 2026 CSLB standards, industry codes, and California state laws.
How It Works
Your path to your CSLB California Contractor License in three simple steps
Master Law & Trade
Practice with exam-style questions covering the CSLB Law & Business and C-10 Trade Exam.
Take Practice Exams
Experience the real exam environment with our full-length practice tests
Pass Your State Exam
Walk into your exam with confidence and obtain your license or certification
Why StudentsTrust Us
Join thousands of southern and northern California contractors who passed their CSLB exam with us
"Passed my C-10 Trade exam on my first try! The multiple-choice questions here taught me exactly how to think through the NEC code scenarios quickly. The load calculation and safety questions were spot-on with the real test at the PSI center."
"I was most nervous about the Law & Business exam — contracts, liens, bonds, and CSLB regulations. This platform broke it all down with clear explanations. The practice tests simulated the real PSI exam perfectly. Got my C-10 license on the first attempt!"
"After practicing with this platform, I walked into the PSI testing center feeling completely confident. Passed both the Law & Business and C-10 Trade exams on the same day! The clear explanations of Cal/OSHA and NEC were lifesavers."
"The C-10 exam is no joke — you need to know Cal/OSHA safety orders and electrical theory inside and out. This question bank covered everything from lockout/tagout procedures to general electrical knowledge. Exactly what I needed!"
"The planning and estimating section makes up almost 30% of the Trade exam, and this question bank nailed it. Blueprint reading, material selection, and electrical calculations — every question had detailed explanations."
"I was struggling with voltage drop calculations and conduit fill questions. The dedicated practice modules here were a lifesaver. Passed my C-10 exam with flying colors!"
Pass Guarantee
If you don't pass your official CSLB Law & Business or C-10 Trade exam after completing our Premium package, we'll instantly refund the full amount. No questions asked. No fine print.
Everything You Need to Pass
Get complete access to our comprehensive prep platform for the CSLB Law & Business and C-10 Trade exams
950+ Questions for EACH Exam
Dedicated for Law & Business and C-10 Trade, divided logically by section.
Full-Length Practice Tests
Simulate the real test experience with practice exams
Detailed Explanations
Understand the why behind every answer with comprehensive explanations
Pass Guarantee
100% money-back guarantee if you don't pass your test
Your Questions Answered
Quick answers to the most common questions about our electrical exam prep
Who needs a contractor license in California?
Anyone who constructs or alters any building, highway, road, parking facility, railroad, excavation, or other structure in California must be licensed by the CSLB if the total cost of one or more contracts on the project is $1000 or more (including labor and materials).
What is the best study strategy for CSLB exams?
Because the exams are closed-book, repetition is key. Memorize necessary code articles, load formulas, and legal timelines. We recommend dedicating 60% of your time to the C-10 trade (especially calculations) and 40% to Law & Business.
Why are there two separate exams, and do I need to take both?
Yes, you must pass both exams to obtain your California Contractor License. The Law & Business Exam tests your knowledge of state contracting laws, employee safety, mechanics liens, and business management. The C-10 Trade Exam tests your specific electrical knowledge and trade practices. You need both to operate legally as an electrical contractor. They are typically taken on the same day, one after the other.
What is the format of the two exams?
Both exams are strictly closed-book, multiple-choice, computer-assisted tests given at official CSLB testing centers. The Law & Business exam contains 115 questions, and the C-10 Trade exam also contains 115 questions. You have exactly 3.5 hours (210 minutes) to complete each exam.
How should I prepare, and are there manuals I can read?
While our website provides a comprehensive question bank and highly realistic mock tests to train your test-taking skills, you should supplement your studies with official material. The CSLB provides free Study Guides on their website for both the Law & Business and C-10 exams. These official guides list exactly which reference books and code books (like the California Electrical Code) you should read to build your foundational knowledge.
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