All your missed questions are saved
automatically for extra practice.
It's a practice test that's automatically made up of all your missed questions. Once you finish this test, you’ll be able to revisit your Challenge Bank™ to practice and sharpen your skills.
View All PlansAdding difficult questions to Challenge Bank™ is an exclusive Premium feature. Unlock access to 650+ exam-like questions, a Pass Guarantee, personalized study plans, and more.
View All Plans| 90-100 | => | 17% |
| 80-89 | => | 33% |
| 70-79 | => | 33% |
| 60-69 | => | 17% |
| <60% | => | 0% |
Welcome to the Golden State! Whether you’re hauling freight along I-5, I-80, or US-101, adding the Doubles/Triples (T) Endorsement to your California Class A CDL can open the door to more job opportunities and higher pay. This endorsement gives you the legal authority to operate double and triple trailer combinations (triples where allowed), competitively setting you apart from drivers without it.
To earn your T Endorsement in California, you must pass the Doubles/Triples Knowledge Test. This test is based on Section 7 of the California Commercial Driver Handbook. It contains 20 multiple-choice questions, of which you must answer at least 16 correctly (80%) to pass. If you fail, you must wait at least one business day before retesting. It’s important to note that California imposes longer delays after repeated failures. After three failed attempts, you must wait 30 days before retesting. Subsequent failures come with even longer wait times. This is precisely why our experts have prepared a state-specific series of practice tests that help ensure you pass your exam on the first attempt!
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
Our California-specific Doubles/Triples Knowledge Practice Tests mirror the DMV’s official test format. With features added to our practice tests that are scientifically proven to increase retention and decrease preparation time, we have done the homework to ensure your time spent with our practice tests is well spent. You’ll get real-time feedback, hints, and AI-driven study tools to guide you along the way. All practice content is based on the latest California CDL Manual and covers coupling and uncoupling procedures, preventing rollovers and jackknifing, managing the “crack-the-whip” effect, correct braking and safe following distances, and detailed trailer inspection steps.
You’ll also need to make sure any “L” or “Z” air brake restrictions are removed from your CDL. This is because most double and triple trailers in the United States use air brakes. Removal of this restriction requires passing the Air Brakes Knowledge Test and completing a skills test in an air brake-equipped vehicle. Luckily, we offer California-specific Air Brakes Practice Tests to help with this step.
Once you’ve added the T Endorsement, you can expand your qualifications with other endorsements like N (Tank Vehicles), H (Hazardous Materials), X (Tank + Hazmat Combo), P (Passenger Transport), and S (School Bus Operation). We provide free California-specific practice tests for each of these!
Explore our full suite of California CDL practice tests and get started today!
Driver’s Ed is - nobody wants to set foot inside the DMV. That’s why millions of learners trust us for simple, visual, effective prep.
We are an officially recognized FMCSA Entry-Level Driver Training provider and a proud partner to over 2,500 libraries. We work with safety organizations like GHSA and the National Safety Council to help create safer roads for everyone.
Our trademarked system automatically saves questions you miss, creating personalized tests that target your weak spots until you’ve mastered the material.
Get smarter as you study. Our new AI-powered feedback provides detailed, question-level insights to help you understand the why behind each answer.
Go beyond the boring black-and-white manual. Our interactive handbook lets you read, listen with an MP3 audio version, or even chat with it to find the information you need, faster.
We build our practice questions from the current 2026 CA Driver Handbook and refine them using patterns recent test‑takers report.
Driver handbook • Knowledge‑test/permit overview • Fees & ID requirements • Office/appointment info
We mirror recurring themes (e.g., right‑of‑way traps, sign look‑alikes) and use similar distractors and wording styles.
We don’t collect or publish actual test items and we’re not affiliated with DMV.
