How to pass the CDL permit test the first time
To get your CDL permit (the commercial learner’s permit) you pass a set of multiple-choice knowledge tests at your state’s licensing office. Everyone takes General Knowledge, typically 50 questions with 40 right to pass (80%). For a Class A license you add Air Brakes and Combination Vehicles. To pass the first time: study from your own state’s manual, learn the numbers, and take practice tests until you pass them every time.
- Class A usually means three tests: General Knowledge, Air Brakes, Combination Vehicles.
- Every test is typically 80% to pass. Endorsements (H, N, P, S, T) are separate tests.
- The questions come from your state’s CDL manual, so study that one, not a generic one.
Which tests you take
| Test | Who takes it | Typical size |
|---|---|---|
| General Knowledge | Everyone | 50 questions, 40 to pass |
| Air Brakes | Anyone driving a vehicle with air brakes | 25 questions, 20 to pass |
| Combination Vehicles | Class A | 20 questions, 16 to pass |
| Hazardous Materials | H endorsement | 30 questions, 24 to pass |
| Doubles & Triples | T endorsement | 20 questions, 16 to pass |
| Tank Vehicles | N endorsement | 20 questions, 16 to pass |
| Passenger Transport | P endorsement | 20 questions, 16 to pass |
| School Bus | S endorsement | 20 questions, 16 to pass |
These are the national model’s figures, which most states use. Confirm the counts in your state’s manual.
A study plan that works
- Get your state’s manualIt is free, and the test is written from it. Read sections 1 to 3 (everyone), section 5 (air brakes) and section 6 (combination vehicles) for Class A. Find your state’s manual.
- Learn the numbersFollowing and stopping distances, air pressures, weights and lengths. Most wrong answers are a number slightly off. The air brakes numbers are the biggest group.
- Practise one test at a timeStart with General Knowledge, the longest. Move on when you pass practice tests for it every time.
- Read every explanation you get wrongKnowing why the right answer is right is what stops the same miss on test day, worded differently.
- Take full-length practice testsThe real test is timed pressure. Do a few full runs at real length before you book it.
Common reasons people fail
- Studying a generic guide instead of their state’s manual, and missing the numbers that differ.
- Memorising answers instead of understanding them, then meeting the same idea worded a new way.
- Booking the test after passing one practice test once.
- Skipping Air Brakes, which ends in an air brake restriction on the license.
Practice tests for your state
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Questions people ask
General Knowledge is typically 50 questions with 40 right to pass. Air Brakes is typically 25 (20 to pass) and Combination Vehicles 20 (16 to pass). Your state manual has the exact counts.
General Knowledge, Air Brakes and Combination Vehicles. Add a test for each endorsement you want: hazardous materials, tank, doubles and triples, passenger or school bus.
It depends on how much time you have each day. A good test of readiness: you pass full-length practice tests for every subject you need, several times in a row, not just once.
Mostly. Every state builds its manual on the same national model, but a few rules and numbers differ, and some states add questions on their own laws. Study your own state’s manual.