- The knowledge exam has up to 50 questions, 60 minutes, and requires an 80% score to pass.
- A Commercial Learner Permit costs $20; the CDL itself, including the exam, costs $60.
- You must hold your CLP at least 14 days before scheduling any skills test.
- A passing knowledge test score stays valid for one year, so time your skills test accordingly.
Fee Fast Facts You Need Before You Apply
Before you memorize a single air brake diagram, get the money and paperwork mechanics locked in. The New Hampshire Division of Motor Vehicles, Department of Safety, administers the NH-CDL program directly - there's no third-party testing vendor to worry about, which simplifies scheduling but means you'll want to double-check documentation requirements before you show up.
Here's what actually costs money:
- Commercial Learner Permit (CLP): $20
- Original or renewed CDL (includes the exam): $60
- Each endorsement or restriction removal: $10
If you're budgeting for endorsements like tank vehicles or hazardous materials, those $10 add-ons stack up fast. For a full breakdown of every fee scenario, including multi-endorsement combinations, see the NH-CDL Certification Cost 2026: Complete Pricing Breakdown.
Exam Format at a Glance
The NH-CDL knowledge test is a multiple-choice exam, capped at 50 questions, with a 60-minute time limit. You need 80% correct to pass. That's a fixed, non-negotiable bar - there's no curve, no partial credit for "close enough" answers on air brake sequencing or hazmat placarding rules.
A pass is good for one year. That single fact should shape your entire testing strategy: if you're pursuing multiple endorsements (say, combination vehicles plus tank vehicles), plan your skills tests inside that twelve-month window so you don't have to retake a written knowledge test you already passed.
For a deeper look at how the scoring threshold works and why 80% is the number to build your entire prep plan around, read NH-CDL Passing Score 2026: Exactly What You Need to Pass. And if you're wondering how the format compares to what people expect from a standard state DMV test, the honest answer is in How Hard Is the NH-CDL Exam? Complete Difficulty Guide 2026.
Key Takeaway
Because a passing score is valid for a full year, sequence your endorsement tests strategically - don't let the clock run out on a domain you've already cleared.
Domain-by-Domain Cheat Sheet
The NH-CDL knowledge exam draws from eight distinct content areas. Not every applicant tests on all eight - your required domains depend on the class of CDL and endorsements you're pursuing - but you need to know which ones apply to your goals. This is the fastest way to avoid wasting study hours on material you'll never be tested on.
Domain 1: General Knowledge
The foundation every applicant tests on. Covers vehicle inspection, basic control, shifting, backing, and general safe-driving practices.
- Required for every CDL class and every applicant
Domain 2: Air Brakes
Required if your vehicle has air brakes (most commercial trucks do). Covers system components, dual air systems, and low-air warning procedures.
- Skipping this domain restricts you from operating air-brake-equipped vehicles
Domain 3: Combination Vehicles
Needed for anyone pursuing a Class A license. Covers coupling/uncoupling, combination vehicle handling, and inspection sequences unique to tractor-trailers.
- Pairs closely with Domain 2 material on brake systems
Domain 4: Tank Vehicles
Endorsement-specific domain covering liquid surge, baffled vs. unbaffled tanks, and inspection procedures unique to bulk liquid hauling.
- Adds a $10 endorsement fee on top of your CDL cost
Domain 5: Passenger Transport
Required for the passenger (P) endorsement. Covers loading/unloading procedures, emergency exits, and passenger management.
Domain 6: Doubles and Triples
Required for the combination endorsement. Covers coupling multiple trailers, handling characteristics, and inspection of multi-trailer setups.
Domain 7: Hazardous Materials
One of the densest domains - covers placarding, shipping papers, segregation rules, and emergency response basics. ELDT completion is required before this test.
Domain 8: School Bus
Required for the school bus (S) endorsement, on top of passenger transport knowledge. Covers loading zones, railroad crossings, and student management.
For a full walkthrough of how these eight domains interact and which combinations apply to common career paths, see the NH-CDL Exam Domains 2026: Complete Guide to All 8 Content Areas.
Eligibility Snapshot
Before you can even sit for the knowledge test, you need the following in order:
- A valid New Hampshire driver license
- Required identity and residency documents
- Current medical certification, unless you qualify for an exception
- Applicable ELDT completed before any relevant skills or hazmat test
Once you pass the knowledge test and receive your Commercial Learner Permit, you're not done - New Hampshire requires the CLP to be held for at least 14 days before you can schedule the skills test. Plan around this waiting period; it's a hard floor, not a suggestion.
For the complete document checklist and a breakdown of who qualifies for medical certification exceptions, see NH-CDL Requirements 2026: Eligibility, Prerequisites & How to Qualify.
One-Week Domain Scheduling Plan
You don't need an elaborate study system to prepare for the NH-CDL - you need a schedule that respects which domains actually apply to your endorsement goals. Here's a simple week-based structure built around the domain list above, not generic test-prep theory.
General Knowledge + Air Brakes
- Master Domain 1 basics: inspection, backing, shifting
- Layer in Domain 2 air brake systems since most trucks require it
Combination Vehicles (if pursuing Class A)
- Focus on coupling/uncoupling sequences in Domain 3
- Take practice questions daily against the 80% passing bar
Endorsement-Specific Domains
- Study only the domains tied to your target endorsements: Tank Vehicles, Passenger Transport, Doubles/Triples, Hazmat, or School Bus
- Confirm ELDT is complete for hazmat or skills tests
Full Simulated Runs
- Time yourself under the 60-minute, 50-question format
- Review missed questions by domain, not randomly
This structure works because it mirrors how the exam is actually organized - by domain, not by difficulty. For a more detailed first-attempt strategy, including how to prioritize weak domains, read the NH-CDL Study Guide 2026: How to Pass on Your First Attempt.
Renewal Clock and Medical Certification
Passing the exam is not the finish line - it's the start of a five-year clock. New Hampshire CDLs expire on the holder's birthday in the fifth year after issuance. That's a birthday-based expiration, not an anniversary-of-issuance date, so mark the correct year on your calendar now rather than guessing later.
Medical certification has to remain current throughout that entire five-year period unless you're exempt. Letting your medical card lapse can affect your CDL status even if your license itself hasn't technically expired, so track both dates independently.
If you're still deciding whether pursuing a CDL is worth the fees, the ELDT time investment, and the ongoing medical certification upkeep, the Is the NH-CDL Certification Worth It? Complete ROI Analysis 2026 article and the NH-CDL Salary Guide 2026: Complete Earnings Analysis lay out the career-side considerations. Once you're ready to see what jobs actually look for, check NH-CDL Jobs.
Quick Reference Table
| Item | Detail |
|---|---|
| Administering Authority | New Hampshire Division of Motor Vehicles, Department of Safety |
| CLP Cost | $20 |
| CDL Cost (includes exam) | $60 |
| Each Endorsement/Restriction Removal | $10 |
| Knowledge Test Length | Up to 50 multiple-choice questions |
| Time Limit | Up to 60 minutes |
| Passing Score | 80% |
| Passing Score Validity | 1 year |
| Minimum CLP Holding Period | 14 days before skills test |
| CDL Expiration | Birthday in the 5th year after issuance |
Keep this table bookmarked next to the domain list above - between the two, you have the entire administrative and content skeleton of the NH-CDL exam in one glance. For background on how this credential is defined and referenced across the industry, browse What Is NH-CDL?, NH-CDL Meaning, and What Does NH-CDL Stand For?.
Frequently Asked Questions
Up to 50 multiple-choice questions, with a 60-minute time limit and an 80% score required to pass.
The Commercial Learner Permit is $20, the original or renewed CDL (including the exam) is $60, and each endorsement or restriction removal costs $10. Total cost depends on which endorsements you pursue.
A passing score remains valid for one year, so schedule your skills test and any endorsement tests within that window.
No. New Hampshire requires you to hold your Commercial Learner Permit for at least 14 days before you can take the skills test.
It expires on the holder's birthday in the fifth year after issuance. Medical certification must also remain current throughout that period unless you qualify for an exception.
Keep this cheat sheet handy as your one-page reference, but pair it with focused practice on ../ and a deeper review of the NH-CDL Pass Rate 2026: What the Data Shows and NH-CDL Exam Dates 2026: Testing Windows, Deadlines & Scheduling so nothing about fees, domains, or deadlines catches you off guard on test day.