You studied the manual cover to cover. You watched every YouTube video about air brakes. Your buddy told you the test was “mostly common sense.” You sit down at the DMV computer, the timer starts, and you realize you have no idea how many questions are coming, what the passing score is, or how long you have. The anxiety alone costs you three wrong answers in the first ten minutes.
Knowing how many questions are on the CDL permit test is not trivia - it is strategy. If you know you only need 40 out of 50 on General Knowledge, you can skip the hardest questions and bank easy points. If you know the test ends the moment you pass or fail, you can pace yourself differently. If you know Air Brakes is only 25 questions, you can push through fatigue instead of giving up.
This guide gives you the exact question counts, passing thresholds, and the Skip Button strategy that turns nervous test-takers into confident ones.
The Core Breakdown: Class A vs. Class B
The CDL permit test is not one massive exam. It is a series of separate sections, each graded independently. You can pass one and fail another. The sections you pass stay on your record while you retake the ones you missed.
Class A Permit Test (Tractor-Trailer)
If you want to drive a Class A combination vehicle, you must pass three sections:
- General Knowledge: 50 questions
- Air Brakes: 25 questions
- Combination Vehicles: 20 questions
- Total: 95 questions
You do not have to take all three on the same day, but most applicants do to get it over with. Each section has its own timer and its own passing threshold.
Class B Permit Test (Straight Trucks, Buses)
Class B vehicles do not pull heavy trailers, so you skip the Combination Vehicles section entirely:
- General Knowledge: 50 questions
- Air Brakes: 25 questions
- Total: 75 questions
Skip the Air Brakes test and you get an L restriction on your license, which bars you from driving any vehicle with air brakes. Since nearly all Class B trucks over 26,001 lbs use air brakes, the L restriction makes you essentially unemployable. Just take the Air Brakes test.
The 80% Rule: How Many Can You Miss?
Every section of the CDL permit test requires an 80% score to pass. Here is your survival cheat sheet - memorize the “Max You Can Miss” column.
| Test Section | Total Questions | Must Answer Correct | Max You Can Miss |
|---|---|---|---|
| General Knowledge | 50 | 40 | 10 |
| Air Brakes | 25 | 20 | 5 |
| Combination Vehicles | 20 | 16 | 4 |
| HazMat (H) | 30 | 24 | 6 |
| Tanker (N) | 20 | 16 | 4 |
| Doubles/Triples (T) | 20 | 16 | 4 |
| Passenger (P) | 20 | 16 | 4 |
| School Bus (S) | 20 | 16 | 4 |
The “Sudden Death” Feature
Most DMV testing systems use adaptive software. The test stops the moment you pass or fail.
- Passing early: If you answer the first 40 General Knowledge questions correctly in a row, the screen flashes “PASS” and the test ends. You never see the remaining 10 questions.
- Failing early: If you get 11 questions wrong before reaching 40 correct, the screen goes red and says “FAIL.” The test kicks you out immediately.
This feature is why the Skip Button is so powerful - it lets you control which questions count toward your total.
Endorsement Question Counts
If you want to maximize your earning potential, you will add endorsements to your CDL permit test schedule. Each endorsement is a separate exam with its own question count and passing threshold.
HazMat (H): 30 Questions
The longest and most detailed endorsement test. It covers placarding rules, shipping paper requirements, segregation tables, loading and unloading procedures, and emergency response protocols. You can miss up to 6. This test requires ELDT theory course completion before the DMV will unlock it.
Tanker (N): 20 Questions
Relatively short. Focuses on liquid surge, baffled vs. smooth bore tanks, outage requirements, and weight distribution in partially filled tanks. You can miss up to 4.
Doubles/Triples (T): 20 Questions
Covers converter dolly connections, the crack-the-whip effect on rear trailers, and specific coupling procedures for multi-trailer combinations. You can miss up to 4.
Passenger (P): 20 Questions
Covers bus evacuation procedures, mirror adjustment for passenger vehicles, and emergency exit requirements. You can miss up to 4.
School Bus (S): 20 Questions
Covers student loading and unloading procedures, railroad crossing protocols specific to school buses, and state-specific school bus regulations. You can miss up to 4. You typically must pass the P test before attempting the S test.
State Exceptions to the Standard Counts
The AAMVA model is the standard in 98% of states, but some states add their own tests.
Texas: Section 14 (Special Requirements)
Texas requires a fourth test that no other state demands. The Texas Commercial Rules exam, commonly called Section 14, covers state-specific regulations.
- Question count: 20 questions
- Topics: Vehicle lighting requirements, maximum vehicle height (14 feet), farm exemptions, and state traffic laws
- Impact: A Texas Class A applicant takes 4 tests totaling 115 questions instead of the standard 95
This catches many applicants who transferred from other states and only studied the federal manual. Study Section 14 separately - it has its own section in the Texas CDL handbook.
Other State Variations
Some states shorten the Air Brakes section to 20 questions instead of 25, or combine certain elements into fewer tests. Always prepare for the standard AAMVA counts listed above. If you study for 25 questions and only get 20, you are over-prepared. That is exactly where you want to be.
Practice Questions: CDL Permit Test Strategy
The testing software stops the moment you reach the passing threshold. At 39 correct, one more right answer puts you at 40 - the minimum to pass. The screen flashes "PASS" and the test ends. You never see the remaining 2 questions.
The Skip Button is the most underused tool on the **CDL permit test**. Skipping sends the question to the back of the queue without penalizing you. Answer all the easy questions first to bank correct answers. If you reach the passing threshold before the hard questions cycle back, the test ends and you never have to answer them.
Texas adds the Section 14 Special Requirements test (20 questions) on top of the standard 95 questions for General Knowledge, Air Brakes, and Combination Vehicles. Total = 50 + 25 + 20 + 20 = 115. This is the highest question count of any state for a Class A permit.
Each section of the **CDL permit test** is graded independently. Your General Knowledge score stays on record. You retake only the Air Brakes section after the mandatory waiting period (1 to 7 days depending on your state) and pay the retest fee.
The Skip Button Strategy (Detailed)
Knowing how many questions are on the CDL permit test unlocks the most powerful test-taking strategy available: aggressive skipping.
On most DMV testing systems, the Skip button sends a question to the back of the queue without counting it as correct or wrong. Here is how to use it:
- Read each question once. If you know the answer immediately, answer it and bank the point.
- If you hesitate for more than 10 seconds, skip it. Do not guess. Guessing burns one of your allowed misses.
- Keep skipping until the easy questions are gone. If you answer 38 easy questions correctly and skip 12 hard ones, you only need 2 more correct answers from the hard pile to pass.
- Some of the hard questions may never return. If you hit 40 correct before the skipped questions cycle back, the test ends and you pass without ever answering them.
This strategy works because the test stops the instant you pass. Every skipped question is a bet that you will reach 40 correct without needing to answer it.
Time Limits: Do You Need to Rush?
Most states give you generous time:
- General Knowledge (50 questions): 60 to 90 minutes - over 1 minute per question
- Air Brakes (25 questions): 30 to 45 minutes
- Combination Vehicles (20 questions): 25 to 35 minutes
- Endorsements (20-30 questions): 25 to 40 minutes
Most questions can be answered in 15 seconds if you know the material. You have plenty of time. Read every question twice. Look for words like “not,” “except,” “always,” and “never” - a single word can flip the entire meaning of the question.
Conclusion
So how many questions are on the CDL permit test? For Class A, plan for 95 questions across three sections. For Class B, plan for 75 across two sections. For Texas Class A, plan for 115. Every section requires 80% to pass, and each section is graded independently.
The numbers are not intimidating when you break them down. Study one section at a time. Memorize the PSI values for Air Brakes, the following distance formula for General Knowledge, and the coupling sequence for Combination Vehicles. Use the Skip button on test day to bank easy points and avoid guessing on hard questions.
For practice questions organized by section, try our Free CDL Practice Test. For the complete study roadmap, check our CDL Permit Test Study Guide. For Texas-specific preparation, see our Texas CDL Process Guide.
Frequently Asked Questions (FAQ)
How many questions are on the CDL permit test for Class A?
The Class A CDL permit test has 95 questions total across three independently graded sections: General Knowledge (50 questions), Air Brakes (25 questions), and Combination Vehicles (20 questions). In Texas, a fourth section called Special Requirements adds 20 more questions for a total of 115.
How many questions can you miss on the CDL permit test?
You can miss up to 10 on General Knowledge (50 questions), 5 on Air Brakes (25 questions), 4 on Combination Vehicles (20 questions), and 6 on HazMat (30 questions). Every section requires an 80% passing score. The test ends the moment you reach the passing threshold or exhaust your allowed misses.
Is the CDL permit test timed?
Yes, but the time limits are generous. Most states allow 60 to 90 minutes for General Knowledge and 30 to 45 minutes for the shorter sections. This gives you over a minute per question on every section. Do not rush - read each question carefully and use the Skip button on questions you are unsure about.
Can you take the CDL permit test in Spanish?
Many states offer the written CDL permit test in Spanish at the DMV computer kiosk, including Texas, California, Florida, Illinois, New Jersey, New York, and Arizona. The road test and Pre-Trip inspection remain English-only in every state under FMCSA regulation 49 CFR 391.11.
Do you have to pass all CDL sections on the same day?
No. Each section is graded independently. You can take General Knowledge on Monday, Air Brakes on Wednesday, and Combination Vehicles the following week. Passed sections remain valid for 6 to 12 months depending on your state. You only retake the sections you failed.
What happens if you fail the CDL permit test?
You can retake the failed section after a waiting period of 1 to 7 days, depending on your state. You pay a retest fee of $10 to $25 per attempt. There is no limit on retakes, but each one costs money and time. Use practice tests to identify your weak areas before returning to the DMV.