How to prepare for the CSLB general B exams (Law & Business + trade)

The two exams are the one part of getting your general B license you can actually study for — everything else is paperwork and waiting. The good news: both are multiple choice, both are closed book, and both are drawn from published topic lists. If you know what's on them and drill the right things, they're very passable. Here's how.

Start with the free CSLB study guides

Before you buy any prep course, download the two free guides CSLB publishes:

• the B General Building study guide, and
• the Law and Business study guide.

Both are PDFs on cslb.ca.gov. Each one lists the exact topic areas on the exam, shows how each area is weighted, and recommends reference materials. This is the blueprint the test is built from — and most applicants never open it. Start here, then decide whether you also want paid prep.

What's on the Law and Business exam

This exam is the same for every classification, so it's worth doing well once. It covers:

• California construction law and licensing rules
• Contracts, and the rules for home-improvement contracts
• Mechanic's liens and the notices around them
• Employment and labor requirements
• Insurance, bonds, and workers' comp
• Business finances and recordkeeping
• Public works and jobsite safety

The reason people fail it isn't the concepts — it's the specific numbers. The exam tests exact dollar thresholds (the contract amount that triggers a written-contract requirement), time limits (how long you have to file a lien), and penalties (what unlicensed work costs — a number that just went up in 2026). You can't look those up in the room, so treat them like vocabulary and drill them until they're automatic.

What's on the B trade exam

The B trade exam covers general building — the coordination of multiple trades that defines the classification. The CSLB study guide has the exact current weighting, but the shape is roughly:

• Framing and structural components — wall framing, roof and floor systems, shear walls, headers, seismic hardware. One of the heaviest sections.
• The core trades — basic electrical, plumbing, and HVAC; concrete, grading, weatherproofing, insulation. Also heavily weighted — the B has to understand every trade it coordinates.
• Planning and estimating — reading plans, cost estimation, code compliance, scheduling.
• Finish trades — drywall, tile, cabinetry, paint, flooring, finish carpentry.
• Safety — site protection, OSHA, traffic control, environmental concerns.

You're not being tested as a master of any one trade — you're being tested on knowing enough of each to build and supervise a whole structure. Breadth beats depth here.

A study plan that fits the format

Both exams are closed book and multiple choice, so study the way you'll be tested:

1. Read a section, then immediately test yourself on it. Practice questions show you which facts actually stuck versus the ones you only thought you knew. Reading alone is the most common way people over-estimate how ready they are.
2. Drill the numbers. Make a single sheet of every dollar amount, notice period, and day limit, and review it daily until each one is automatic. This is the highest-return hour of study you'll do for the Law and Business exam.
3. Simulate closed-book, timed conditions. If you always study with the book open, test day feels foreign. Once a topic feels solid, close everything and answer under time pressure.
4. Weight your time by the exam's weighting. Spend the most time on framing/structural and the core trades for the B, and on the numbers for Law and Business. Don't burn a week on a 5%-of-the-exam topic.

After you pass

Passing both exams means you're days from an active license — once your bond, comp, and license fee are in place. From that point on, the studying is over and the maintaining begins: a B license has to stay renewed every two years with the bond current and your entity in good standing, or it suspends. Contractor License Vault watches all of that for you once you're licensed — so the credential you just earned doesn't quietly lapse a few years down the road.