A useful Class B CDL practice test should answer one question first: which modules does the vehicle and job actually require?
Class B generally covers a single vehicle with a GVWR or actual gross vehicle weight of at least 26,001 pounds, or such a vehicle towing another vehicle that does not exceed 10,000 pounds GVWR or actual gross vehicle weight, whichever is greater. That can include straight trucks and buses, but the required knowledge tests are not identical for every Class B job.
Build Your Class B Test Plan
| Target vehicle or work | Prepare this first | Add before scheduling |
|---|---|---|
| Straight truck without air brakes | General Knowledge | State-specific material |
| Dump, refuse, concrete, or delivery truck with air brakes | General Knowledge | Air Brakes |
| City or coach bus | General Knowledge + Passenger | Air Brakes if equipped |
| School bus | General Knowledge + Passenger + School Bus | Air Brakes if equipped |
| Qualifying tank vehicle | General Knowledge + Tanker | Air Brakes or HazMat when applicable |
Class B applicants normally do not need Combination Vehicles. Do not spend your limited study time there unless your state or intended vehicle configuration tells you otherwise.
Start With Two Separate Readiness Scores
General Knowledge tests broad safe-driving decisions. Air Brakes tests a specific system. Combining the two into one vague “I feel ready” judgment hides the module most likely to cause a failure.
Class B readiness: step one
Take the General Knowledge diagnostic without notes. If you miss inspection, stopping-distance, hazard, or cargo questions, use the complete 1,500+ question bank to practice those weak areas before booking your test.
Start the Free General Knowledge Diagnostic →If your target vehicle uses air brakes, take the Air Brakes diagnostic separately. A good General Knowledge score does not protect you from an air-brake restriction.
What to Practice for Class B General Knowledge
Focus on decisions that apply to the single heavy vehicle you expect to drive:
- vehicle inspection and defect decisions;
- space, speed, following distance, and stopping distance;
- hazard recognition, night driving, and poor weather;
- cargo inspection and securement responsibilities;
- railroad crossings and emergency procedures;
- alcohol, fatigue, distracted driving, and safe-operation rules.
Do not memorize only a list of answers. The state can test the same rule through a different driving scenario. For each missed question, find the matching heading in your state manual and explain why the other options are unsafe.
Air Brakes: Avoid Preparing for the Wrong Outcome
If you want to operate full-air-brake Class B vehicles, your preparation and test vehicle must support that goal. Study:
- compressor, governor, reservoirs, foundation brakes, and spring brakes;
- warning devices and what to do when pressure is unsafe;
- air-system inspection and leak-test procedure;
- brake lag, stopping distance, fade, and downgrade technique;
- the exact values and sequence printed in your current state manual.
The licensing state decides its test format, and the skills-test vehicle can affect the restriction printed on the CDL. Confirm the vehicle configuration before reserving a test.
A Conversion-Focused 7-Day Study Plan
Day 1: Take General Knowledge and, if applicable, Air Brakes diagnostics. Record the three weakest topics in each.
Days 2–3: Read only the matching state-manual sections, then answer new questions from those topics.
Days 4–5: Run mixed practice. Review every wrong answer and every answer you guessed correctly.
Day 6: Take a timed module test without notes. The federal pass standard is 80%; aim for repeatable results around 90% before paying for the state attempt.
Day 7: Confirm documents, fees, appointment, required modules, and retest policy on the state site. Do not use a national article for state administrative details.
ELDT and the Class B Skills Test
If you are obtaining a Class B CDL for the first time and the federal ELDT rule applies, you must complete the required training from a provider listed in the FMCSA Training Provider Registry before taking the Class B skills test. That training requirement does not replace your state knowledge tests or independent preparation.
Verify the provider before paying at the FMCSA Training Provider Registry.
Frequently Asked Questions
What tests are required for a Class B CDL?
General Knowledge is the starting point. Add Air Brakes and endorsements based on the vehicle and job. Passenger and School Bus require their own preparation; tanker or HazMat work can add N or H requirements. States may add local tests.
Is Class B easier than Class A?
The path usually has fewer modules because Class B applicants normally skip Combination Vehicles. The remaining tests are not optional, and a bus or air-brake vehicle can still require several modules.
Can I take the official Class B knowledge test online?
Testing procedures are state-controlled. Use online practice for preparation, but check your state’s official site for where and how the scored exam is administered.
When am I ready to schedule?
Schedule when you can repeatedly score above the 80% legal threshold in every required module without notes and can explain your misses. One passing practice result is not a reliable readiness signal.
Official sources
- FMCSA: CDL drivers and license classes
- FMCSA: State CDL knowledge and skills testing
- FMCSA: Entry-Level Driver Training
- FMCSA Training Provider Registry