Exam-style B questions
Multiple-choice items matched to the phrasing and structure of the California Class B exam.
California CSLB · Classification B
California Class B general building contractor exam prep — online, no classroom.
Self-paced prep for both California exams you need to pass — the Class B exam and Law & Business — built around exam-style questions, instant rationales, and readiness tracking. Practice real-format questions, read clear rationales, and track readiness across both exams on any device.
Covers
2 exams
Both exams most applicants need
Questions
2.7k+ items
California-specific practice
Access
3 or 6 months
24/7 on any device
Self-paced
Instant rationales
Bundle or buy separately
Optional AI Pro
3 months access
Exam prep package
Access length
Expanded hints, follow-up questions, and help in your language when you need more context.
$20/mo
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.
Free practice test
Try a free practice test
Sample real exam-style questions with instant explanations — no login required.
No login
Instant explanations
8 languages
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.
Rationale on every answer
Short explanations tie each answer back to the rule so you learn as you practice.
Readiness tracking
See where you stand by topic and tighten weak areas before exam day.
Any device, any time
Practice on phone, tablet, or desktop without a class calendar to keep.
About the exam
What to know before you start.
A quick confirmation so you know you're on the right prep page before you start.
Who takes this exam
The California B — General Building Contractor exam is for contractors who run projects involving at least two unrelated building trades beyond framing or carpentry. Think homebuilders, remodel contractors, tenant-improvement GCs, and developers who self-perform.
The classification is built for people managing the full job: coordinating subs, sequencing work, reading plans, handling code issues, estimating scope, and keeping multiple parts of a project moving at the same time. If your work usually crosses framing, concrete, roofing, finishes, and the core mechanical trades, B is the lane you're preparing for. If you're pursuing a single-trade license such as electrical, plumbing, or HVAC, you're looking at a C-classification instead — not B.
Most first-time California applicants also need to pass Law & Business alongside the Class B exam, which is why this prep bundles both into one practice flow.
Topics at a glance
Planning
Scope, code compliance, plans and specs, estimating
Framing
Subfloor, walls, roof, seismic hardware, decks
Core trades
Plumbing, electrical, HVAC, concrete, roofing
Finish
Tile, flooring, drywall, cabinetry, windows and doors
Safety
Personnel, traffic control, environmental
Content status
Question bank and official sources
We keep this prep tied to CSLB documents, current code editions, and the live Test2Pro question bank.
Question bank last updated: June 2026.
When a practice item depends on a code citation, we review it against the current edition listed for this exam.
Current code references
- 2025 California Building Code, Title 24 Part 2(2025 edition, effective January 2026)
- 2025 California Electrical Code, Title 24 Part 3(2025 edition, effective January 2026)
- 2025 California Energy Code, Title 24 Part 6(2025 edition, effective January 2026)
- 2025 California Fire Code, Title 24 Part 9(2025 edition, effective January 2026)
- 2025 California Green Building Standards Code, Title 24 Part 11(2025 edition, effective January 2026)
- 2025 California Mechanical Code, Title 24 Part 4(2025 edition, effective January 2026)
- 2025 California Plumbing Code, Title 24 Part 5(2025 edition, effective January 2026)
- 2025 California Residential Code, Title 24 Part 2.5(2025 edition, effective January 2026)
- California Code of Regulations, Title 8 - Cal/OSHA Safety Orders(2025 edition in the CSLB guide; current DIR text online)
CSLB sources
The Test2Pro content team keeps these sources current.
We re-check them each quarter and whenever CSLB publishes major guide changes.
Why this format
Built for working contractors, not classrooms.
Most candidates are fitting study around jobsites and workdays. The format reflects that.
Self-paced
Run short sessions during the week or longer blocks on weekends without losing momentum.
Online, no scheduling
No class calendar, no commute, and no prep-center appointment to keep.
Practice-first
Spend study time on exam-style questions and rationales instead of lecture-style filler.
Coverage
What's included in Class B prep
Below is the current breakdown of topics included in the California Class B general building contractor exam prep.
Supporting detail · 2.7k+
Planning and Estimating
~200+ items
- Scope of work and code compliance
- Design and construction error identification
- Shop drawings, plans, and specifications
- Field inspection performance
- Coordination of project
- Cost estimation for materials, equipment, and labor
Framing and Structural Components
~400+ items
- Subfloor and wall framing
- Roof framing
- Seismic hardware requirements and installation
- Siding and stucco
- Decks and stairs
Core Trades
~400+ items
- Plumbing
- Electrical
- HVAC
- Concrete
- Earthwork and surveying
- Insulation, acoustical, and weatherproofing
- Roofing
Finish Trades
~300+ items
- Painting, staining, coating, and interior wall covering
- Tile and stone
- Floor covering
- Cabinetry and millwork
- Plaster, drywall, and ceilings
- Windows, skylights, and doors
- Landscaping
Safety
~300+ items
- Personnel safety
- Transportation and traffic control
- Environmental safety
Also required for most applicants
Don't forget Law & Business.
Nearly every California contractor license applicant needs to pass Law & Business in addition to the B trade exam, so most people bundle both in one prep path.
Optional exam
Law & Business
Business organization, finances, employment, insurance, contracts, public works, and safety.
If you want it separately, See Law & Business prep
2.7k+
Practice items in the Class B bank
Combined California-specific coverage for the Class B exam and bundled Law & Business.
24/7
Online access, any device
Phone, tablet, and desktop study access whenever you need it.
3 or 6
Months of access
Pick the term that matches how soon you sit for the exam.
100%
California-specific prep
Built around the California CSLB licensing context, not generic contractor content.
"The B prep finally put trade topics and Law & Business in one place. My weekly plan stayed focused instead of scattered."
KD
Kendra D.
B General Building Candidate
Common questions
Before you start.
How does Test2Pro fit into Class B exam prep?
Use Test2Pro for online Class B and Law & Business practice, rationales, and readiness tracking. Applications, scheduling, and testing happen outside the product.
Do I need the Law & Business bundle?
Most first-time California contractor applicants need to pass Law & Business in addition to the Class B exam, so bundling both is the efficient path unless you've already passed Law & Business.
How long should I study before exam day?
Most candidates finish the core prep inside 3 months of part-time study. A 6-month term is the safer choice if you're juggling active projects or a heavy estimating load.
What happens when my access expires?
After your active access ends, you can renew month to month at $40, or $60 with AI Pro. No auto-charges while your current term is still active.
What is AI Pro?
An optional add-on with expanded hints, follow-up questions, and help in your language when you need more context. Use it as study help, not the source of truth.
Can I practice on my phone?
Yes. The practice workspace works on phone, tablet, and desktop, so prep moves with you between the jobsite, the office, and home.
Ready when you are
Start practicing for your California Class B license today.
Three months of access, 2.7k+ California-specific questions, and instant rationales. Bundle Law & Business and cover both required exams in one buying flow.