Free California Class B General Building Contractor Practice Test

CSLB requires a Class B license for projects that involve two or more unrelated building trades — a remodel that touches framing, plumbing, and electrical, for example. Single-trade work usually belongs under a Class C specialty classification, and large engineered works fall under Class A (General Engineering). CSLB defines the official classifications and scope rules.

The Class B trade exam draws from five published CSLB topic areas: Planning and Estimating (15%), Framing and Structural Components (20%), Core Trades (30%), Finish Trades (20%), and Safety (15%). Core and finish trades together carry half the exam, so broad coverage matters more than depth in your own trade. The free sample above groups your answers by those same areas.

Class A (General Engineering) covers fixed works that require specialized engineering knowledge — grading, paving, pipelines. Class B (General Building) covers structures that involve two or more unrelated trades, and it is California's most-held license. Pick the classification that matches the work you contract for; CSLB defines the official scope rules.

It is a short sample rather than a full mock exam — enough real-format Class B questions to produce a per-topic breakdown across all five areas, from planning and estimating through safety. You can finish it in a few minutes, with no login, no payment, and no time limit. The full prep then covers the complete Class B question bank, with saved practice history and readiness tracking.

No — just answer the questions and your breakdown appears immediately, grouped by the five Class B topic areas. Each answer comes with an instant explanation, so you learn the reasoning while the scenario is still fresh — the way you would check a detail on a jobsite, not memorize a textbook.

No — CSLB does not publish a fixed passing score, and a short sample cannot forecast a 3.5-hour closed-book exam. What it shows is where you stand across the Class B areas: because core and finish trades carry half the real exam, a weak score there is the most useful early warning. Use the breakdown to pick your first study block, then track readiness in the full prep.