Free CDL Practice Test 2026
25,000+ practice questions covering General Knowledge, Air Brakes, Hazmat, and every endorsement — for all 50 states. Updated for 2026 FMCSA regulations.
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Reviewed by Jack Mahana, CDL Instructor (13+ years)
Last verified: August 2026 · FMCSA-compliant content
Reviewed & Verified by Jack — CDL & ELDT Training Lead
Every practice test on CDL Study Buddy is built from the official state CDL handbooks and the FMCSA's federal question set, then reviewed by our training lead, Jack — head of our registered ELDT theory training listed on the FMCSA Training Provider Registry.
Content last verified: August 1, 2026 · Matches 2026 state handbooks & FMCSA standards.
What to Expect on Your CDL Written Test
The CDL knowledge test is your first major step toward a commercial driving career. Every state administers these tests through their DMV, and the questions come directly from the CDL handbook. The test is federally standardized across all 50 states — what you study for one state applies everywhere.
The General Knowledge test is required for every CDL applicant. It covers safe driving practices, vehicle systems, cargo securement, hours of service, and federal regulations. If you're applying for a Class A CDL, you'll also take the Combination Vehicles test. If your vehicle has air brakes, add the Air Brakes test. Each endorsement — Hazmat, Tanker, Passenger, School Bus, Doubles/Triples — has its own written test.
Most states require an 80% passing score on each section. Our practice tests mirror the real DMV format so you walk in knowing exactly what to expect. We offer two study modes: DMV Simulator (timed, no hints — just like test day) and Learning Mode (untimed, instant feedback after every question).
CDL Test Format: What's on the Exam
The CDL knowledge test isn't one exam — it's a set of written tests, each covering a different subject. Which tests you take depends on the class of CDL you're applying for and which endorsements you need.
Every CDL knowledge test is federally standardized by FMCSA under 49 CFR § 383.135. The passing score is 80% on every section — no exceptions. That means 40 out of 50 on General Knowledge, 20 out of 25 on Air Brakes, and so on. The questions come from your state's CDL handbook, which is built from the same federal question bank.
Required Tests by CDL Class
| Test Section | Questions | Passing | Time (est.) | Required For |
|---|---|---|---|---|
| General Knowledge | 50 | 40 (80%) | 60 min | All CDL applicants |
| Air Brakes | 25 | 20 (80%) | 30 min | Any vehicle with air brakes |
| Combination Vehicles | 20 | 16 (80%) | 25 min | Class A applicants |
| Hazmat (H) | 30 | 24 (80%) | 40 min | Hazmat endorsement |
| Tanker (N) | 20 | 16 (80%) | 25 min | Tanker endorsement |
| Passenger (P) | 20 | 16 (80%) | 25 min | Passenger endorsement |
| School Bus (S) | 20 | 16 (80%) | 25 min | School bus endorsement |
| Doubles/Triples (T) | 20 | 16 (80%) | 25 min | Doubles/triples endorsement |
Time limits are estimates — actual DMV time allowances vary by state. Most states give you 60-90 minutes total for the General Knowledge test.
Retake Rules
If you fail a section, you can retake it. Most states require a waiting period of at least 1 business day before your next attempt. Some states charge a retest fee (typically $10-$25 per section). After three failures on the same test, many states require you to wait longer — sometimes 30 days — before trying again.
If you fail the Air Brakes section, you can still get your permit — but with an air brake restriction (L) that prevents you from operating any vehicle with air brakes. The same logic applies to other endorsement tests: fail the section, get the restriction.
Bottom line: practice until you're consistently scoring 90% or above before you walk into the DMV. Retakes cost time and money you don't need to spend.
CDL Pass Rates: What the Numbers Say
The FMCSA doesn't publish a single national first-attempt pass rate for CDL knowledge tests, and individual states report this data inconsistently. But the pattern is clear from what's available: a significant number of first-time applicants fail at least one section of the written exam.
Why People Fail the CDL Written Test
After years of working with CDL applicants, the same failure patterns show up again and again:
- Underestimating the test. The CDL written exam isn't a basic driver's test — it covers federal regulations, vehicle systems, cargo securement, hours of service, and hazardous materials protocols. Walking in without serious study is the #1 reason people fail.
- Skipping the handbook. Every question on the test comes from your state's CDL handbook. People who rely on practice tests alone — without reading the source material — consistently score lower.
- Air Brakes trips people up. The Air Brakes section has a reputation as the toughest written test. The concepts (brake lag, compressor cut-in/cut-out pressures, air tank drainage) are technical and unfamiliar to most new drivers.
- Test anxiety. Timed tests at the DMV counter create pressure. Applicants who've only studied untimed often freeze when the clock is running.
- Not enough repetition. One or two practice runs isn't enough. The question bank is large — you need repeated exposure to different question variations to build real confidence.
How Practice Tests Improve Your Odds
While we can't quote a specific "practice tests improve pass rates by X%" number (anyone claiming a precise figure is making it up — the FMCSA doesn't track this), the logic is straightforward: the more realistic practice you get, the better you perform.
Our DMV Simulator mode replicates the real test environment — timed, no hints, same question format. Applicants who use it report feeling more prepared and less anxious on test day. Learning Mode fills in knowledge gaps with instant explanations after every question.
Our recommendation: Practice until you can score 90% or above on three consecutive DMV Simulator attempts in each test category. If you can do that, you're ready.
CDL Practice Test Categories
General Knowledge
Core CDL knowledge — required for all drivers
Combination Vehicles
Coupling, uncoupling, and trailer handling
Pre-Trip Inspection
Complete 7-step vehicle inspection process
Texas also includes a 10th state-specific Special Requirements test. Pick your state below for tests built from that state's handbook.
How to Get the Most from CDL Practice Tests
Start with Learning Mode
Begin each test category in Learning Mode. Answer questions without time pressure, read every explanation, and take notes on concepts you don't fully understand. This builds foundational knowledge.
Read the CDL Handbook
Download your state's CDL handbook from our free handbook library. The handbook is the source material for every test question. Use it to fill in knowledge gaps your practice test results reveal.
Switch to DMV Simulator
Once you're consistently scoring above 80% in Learning Mode, switch to DMV Simulator. The timed format builds test-day confidence and helps you manage time pressure.
Track Your Scores
Create a free account to save your scores and track improvement over time. Focus extra practice on categories where your scores are weakest.
Complete Your ELDT Training
If you're applying for your first CDL, you need ELDT theory training before your skills test. Our free online ELDT courses pair perfectly with practice test prep — study both together.
Free vs. Paid CDL Test Prep: What's the Difference?
If you've searched for CDL test prep, you've seen both free and paid options. Here's an honest breakdown of what you actually get — and what you don't need to pay for.
| Feature | CDL Study Buddy (Free) | Typical Paid Course |
|---|---|---|
| Practice Tests | 25,000+ questions, all categories, all 50 states | Varies — some offer fewer questions, some comparable |
| DMV Simulator Mode | ✓ Free | Usually included |
| Learning Mode (with explanations) | ✓ Free | Usually included |
| ELDT Theory Training | ✓ Free — FMCSA-registered | $50-$300+ (often bundled) |
| State-Specific Tests | ✓ Free — all 50 states | Sometimes limited to select states |
| CDL Handbooks (PDF) | ✓ Free downloads | Sometimes included |
| Progress Tracking | ✓ Free account | Usually included |
| Ad-Free Experience | Optional subscription (only paid feature) | Usually ad-free (you paid for it) |
| Behind-the-Wheel Training | Not offered | $3,000-$7,000+ (separate from test prep) |
The Honest Truth About Paid CDL Prep
Paid CDL prep courses aren't scams — many are legitimate businesses offering real value. But here's what you should know before you pay:
- ELDT theory is the big cost differentiator. Many paid courses bundle ELDT theory training with practice tests and charge $50-$300+. Our ELDT theory courses are completely free — FMCSA-registered, same curriculum, no catch.
- Practice test quality varies. Some paid sites use the same federal question bank we do. Others write their own questions, which may or may not match what you'll see at the DMV. More expensive doesn't always mean more accurate.
- Behind-the-wheel training is separate. No online course — free or paid — replaces actual behind-the-wheel training at a truck driving school. That's a separate cost ($3,000-$7,000+) and a separate decision.
- The only thing we charge for is removing ads. Our optional ad-free subscription exists because advertising is what keeps everything else free. If you prefer an ad-free experience, you can pay for it. If you don't mind ads, you never pay a cent.
Our take: Try the free option first. If it has everything you need — and for most CDL applicants, it does — you just saved yourself $50-$300. If you want an ad-free experience, our subscription is there. Either way, you're not locked into anything.
CDL Practice Tests by State
Select your state for state-specific CDL practice tests with local handbook downloads:
State-Specific CDL Test Questions
Does the CDL test differ by state?
The core CDL knowledge test is federally standardized — the General Knowledge, Air Brakes, and endorsement questions come from the same FMCSA question bank regardless of which state you test in. However, some states add a few state-specific questions (Texas, for example, includes a Special Requirements section). The test format, question counts, and 80% passing threshold are consistent nationwide. Download your state's CDL handbook to see exactly what's covered.
Can I complete my ELDT training in my state?
Yes. ELDT theory training is federally mandated and online — you can complete it from any state. Our ELDT courses are listed on the FMCSA Training Provider Registry, which means they meet the federal requirements in all 50 states. Once you finish the theory portion, you'll still need behind-the-wheel training from a local truck driving school or employer — that part is state- and location-specific.
Which states have the hardest CDL tests?
Since the written test is federally standardized, the difficulty is roughly the same in every state. What varies is the DMV experience — wait times, retest fees, and how strictly the skills test is graded. States with major trucking corridors (Texas, California, Illinois, Florida) tend to have higher test volumes and more experienced examiners. The best preparation is the same regardless of state: study the handbook, practice with realistic tests, and walk in confident.
Do I need to take the test in my home state?
Yes. You must apply for your CDL in the state where you hold your regular driver's license. Your CDL is issued by your home state's DMV, and that's where you'll take both the knowledge test and the skills test. If you move to a new state, you'll need to transfer your CDL — which typically means retaking the knowledge test under your new state's administration.
Where can I find state-specific practice tests?
We build state-specific practice tests for all 50 states. Each one is drawn from that state's CDL handbook and includes any state-specific content. Select your state from the list above to start practicing with tests built for your DMV. You can also browse by test category — General Knowledge, Air Brakes, Hazmat, and all endorsements — filtered to your state.
Practice Tests + ELDT Training = Pass Your CDL Faster
If you're applying for your first CDL, you need ELDT theory training before your skills test. Complete it for free while you practice. Both together give you the best preparation — the knowledge you need, tested the way the DMV tests it.
Start Free ELDT TrainingLast updated: August 28, 2026