Trade-specific question bank
Practice built around California C-10 electrical contractor scenarios and code-adjacent decision making.
California CSLB · Classification C-10
California C-10 Electrical Contractor Exam Prep — trade-specific, online.
Self-paced prep for the California C-10 trade exam, plus optional Law & Business in the same buying flow — built around electrical scenarios, not generic contractor content.
Focus
C-10 trade
California-specific electrical prep
Questions
2,300+ items
Exam-style trade scenarios
Access
3 or 6 months
24/7 on any device
Practice 2,300+ California-specific C-10 items with instant rationales on phone, tablet, or desktop.
Add Law & Business when your application requires both exams.
3 months access
Exam prep package
Access length
AI outputs may be incomplete or inaccurate and should be used as study support only. Checkout gives you personal access to digital prep features for the selected term — not a license, certification, permit, or official exam enrollment.
Total
$199.00
Renewal pricing (monthly)
Monthly renewal: $40.00/month ($60.00/month with AI Pro)
Renewal becomes available after your active access expires.
What you get
Practice built to feel like the exam, not a textbook.
Everything is oriented around the exams: how questions are phrased, what they test, and how to move quickly without losing accuracy.
Instant rationales
Review why an answer is right while the scenario is still fresh in your head.
Focused progress tracking
Stay on top of the C-10 topic areas that still need work before test day.
Online from any device
Keep moving from the office, the truck, a jobsite trailer, or home.
About the exam
What the C-10 classification actually is.
A quick confirmation so you know you're on the right prep page before you start.
Who takes the California C-10 exam
The California C-10 — Electrical Contractor exam is for contractors who place, install, erect, or connect any electrical wires, fixtures, appliances, apparatus, raceways, conduits, or electrical equipment — for light, heat, power, or low-voltage communication.
This classification is built for working electricians who plan to run a licensed contracting business in California: reading plans, pulling permits, sizing services, estimating jobs, managing crews, and standing behind their own electrical work on residential, commercial, and light industrial projects.
The C-10 Trade Exam focuses on electrical theory and practice as it applies to a contractor's scope, not on the electrician-certification curriculum used for individual DIR electrician certification. Most first-time California applicants also need to pass Law & Business alongside C-10, which is why the bundle keeps both in one prep path.
Topics at a glance
Exam
C-10 — Electrical Contractor
Best fit
California applicants preparing for the C-10 contractor trade exam
Topic focus
Electrical theory, branch circuits, services and feeders, grounding and bonding
Trade scope
Estimating, planning, plan reading, permits, code applications
Operations
Job safety, crew supervision, low-voltage systems, general contractor scope
Why this format
Built for working contractors, not classrooms.
Most candidates prepping for B are already on jobsites. The format reflects that.
Self-paced
Study around jobs, estimates, and service calls instead of reshaping your week around a class schedule.
Online, no scheduling
Open the prep bank any time, from anywhere — no live class times, no commute, no prep-center appointment.
Trade-focused practice
Stay close to the California C-10 exam instead of broad electrician-school or certification content.
Coverage
What's inside the C-10 prep bank
The live breakdown below shows the electrical trade areas covered across your 2,300+ California-specific C-10 practice items.
Supporting detail · 2,300+ items
Planning and Estimating
~210 items
- Existing system evaluation
- Plan and specification interpretation
- Electrical calculations
- Code requirements
- Material selection
- Energy production and storage project
Rough Wiring
~520 items
- System layout
- Clearance and accessibility requirements
- Raceway and panel installation
- Wire and equipment installation
- Grounding and bonding
- Energy production and storage rough
Finish Wiring and Trim
~90 items
- Finish device placement and installation
- Motor and equipment installation
- Wire and equipment labeling
- Trims and sealants
- Energy production and storage finish wiring
Startup, Troubleshooting, and Maintenance
~200 items
- System energizing and testing
- Common electrical problems
- Location, repair, and replacement of
- Selection and use of electrical testing equipment
- Energy production and storage system
Safety
~350 items
- Lockout/tagout procedures
- Personal protective equipment (PPE)
- Tools/equipment
- Hazardous materials and job site environments
Also required for most applicants
Add Law & Business when your application requires both exams.
Most first-time California contractor applicants need the business exam alongside C-10. The bundle keeps both exams in one prep path without a second purchase.
Optional exam
Law & Business
Business organization, finances, employment, insurance, contracts, public works, and safety.
If you want it separately, See Law & Business prep
2,300+
Practice items in the C-10 bank
California-specific C-10 question coverage with instant rationales.
Trade-specific
Exam focus
Positioned around the California C-10 contractor classification, not electrician certification.
24/7
Online access, any device
Study anywhere between jobsites, estimates, and service calls.
Law & Business
Optional add-on
Bundle the required business exam in the same buying flow when you need both.
Common questions
Before you start.
Is this built specifically for the California C-10 trade exam?+
Yes. The question bank is positioned for California C-10 applicants who want electrical-contractor-specific practice rather than generic contractor prep or electrician-certification study material.
Is this the official CSLB exam?+
No. Test2Pro is independent exam prep for the California C-10 Trade Exam and Law & Business. You still schedule and take the official exams through the CSLB.
Do I also need Law & Business?+
Most first-time California contractor applicants need Law & Business alongside C-10, which is why the bundle keeps both in one prep path. You can add it from the purchase card on this page.
Is this a course or a classroom program?+
No. It is product-led, self-paced online exam prep. There's no class calendar, no commute, and no prep-center appointment — just exam-style practice and rationales.
How long does it take to prepare for C-10?+
Most candidates cover the core C-10 material inside 3 months of part-time study. A 6-month term is the safer choice if you're juggling full-time electrical work or need extra review on estimating and code applications.
Can I study on my phone between jobs?+
Yes. The practice workspace works on phone, tablet, and desktop, so you can run short sessions between service calls or estimating jobs and pick up where you left off.
Ready when you are
Start your California C-10 prep built for working electricians.
Pick the access length that fits your timeline, keep prep online and self-paced, and add Law & Business when your application requires both exams.