- Unrestricted Class A applicants must pass General Knowledge, Air Brakes, and Combination Vehicles at 80% or higher on each.
- The commercial learner's permit costs $29 and stays valid for one year from issue.
- Each knowledge test costs $5; the skills test runs up to $200 total ($10 county fee plus up to $190 to the examiner).
- You must hold your CLP at least 14 days and complete required Entry-Level Driver Training before scheduling the skills test.
Quick Facts Snapshot
If you only have five minutes before heading to the county office, this is the section to reread. The Idaho Transportation Department, Division of Motor Vehicles sets the rules for the commercial learner's permit and CDL process, but the actual knowledge testing happens at county driver-licensing offices, and the skills test is conducted by ITD-approved examiners. That split matters because it means your written test appointment and your driving test appointment may involve different offices and different scheduling logic.
For a deeper walkthrough of every rule bundled into one guide, see the ID-CDL Requirements 2026 guide. This cheat sheet distills the numbers you need to memorize, not the full narrative.
| Item | Detail |
|---|---|
| Commercial learner's permit (CLP) cost | $29 |
| CLP validity period | 1 year |
| Cost per knowledge test | $5 |
| Skills test total cost | Up to $200 ($10 county fee + up to $190 to examiner) |
| Minimum licensed driving experience | 1 year |
| Minimum CLP holding period before skills test | 14 days |
| Passing score per knowledge test | 80% |
The Three Knowledge Domains
The unrestricted Class A path requires three separate knowledge tests, and each one is scored independently against the same 80% threshold. There's no averaging across domains - you either clear 80% on each individual test or you retake that specific test. For a full topic-by-topic breakdown of every subject inside each domain, the ID-CDL Exam Domains 2026 guide is the companion resource to this cheat sheet.
Domain 1: General Knowledge Test
This is the foundational test every CDL applicant takes, regardless of vehicle class. It covers the rules, procedures, and safety practices that apply broadly to commercial driving.
- Vehicle inspection procedures and pre-trip checks
- Basic control of the vehicle, including shifting and backing
- Safe driving practices: speed management, space management, hazard perception
- Handling emergencies and identifying warning signs of mechanical trouble
Domain 2: Air Brakes Test
Required for anyone driving a vehicle equipped with air brakes, which covers most combination vehicles. This domain tests conceptual understanding of the air brake system, not just memorized steps.
- Components of the air brake system and how they interact
- Dual air brake systems and warning devices
- Inspecting and testing air brakes before a trip
- Recognizing brake system problems on the road
Domain 3: Combination Vehicles Test
This domain applies specifically to drivers who will operate tractor-trailers and similar combination rigs. It builds on General Knowledge with content unique to coupling, handling, and inspecting multi-unit vehicles.
- Coupling and uncoupling procedures
- Combination vehicle inspection steps
- Handling and stability differences versus straight trucks
- Emergency procedures unique to pulling a trailer
Key Takeaway
Treat each of the three tests as its own pass/fail event costing $5. Study Air Brakes and Combination Vehicles as distinct bodies of knowledge rather than folding them into general study of "trucking rules."
Fees, Permit Validity, and Timeline
Budgeting for the ID-CDL process means accounting for more than one fee line. Start with the CLP itself: $29, valid for one full year. Within that window you'll pay $5 for each knowledge test you sit for - General Knowledge, Air Brakes, and Combination Vehicles, so budget $15 minimum if you pass each test on the first attempt, more if any retake is needed.
Once your permit is issued and you've held it for at least 14 days, you become eligible to schedule the skills test. That test costs up to $200 total: a $10 fee paid to the county and up to $190 paid directly to the ITD-approved examiner. For a complete cost breakdown with every fee laid out line by line, see the ID-CDL Certification Cost 2026 breakdown.
Eligibility Checklist
Before you even walk into the county office to test, confirm you meet the baseline eligibility requirements. Missing one of these means wasted trips and wasted fees.
- At least one year of licensed driving experience
- Hold the commercial learner's permit for a minimum of 14 days before the skills test
- Complete applicable Entry-Level Driver Training before skills testing
- Pass General Knowledge, Air Brakes, and Combination Vehicles with 80% or higher on each, for the unrestricted Class A path
The exact passing threshold and how it's applied per test - not averaged across the three - is worth reviewing in detail in the ID-CDL Passing Score 2026 guide.
One-Week Cheat Sheet Study Plan
If your CLP clock is already running, you don't need a generic multi-month study calendar - you need a tight plan that respects the order in which these three tests get taken. Here's a compressed schedule built around the domain structure itself.
General Knowledge
- Review vehicle inspection sequence and safe driving practices
- Take practice questions on ../ until consistently scoring above 80%
Air Brakes
- Study dual air brake systems and warning devices in depth
- Focus on pre-trip inspection steps specific to air brake components
Combination Vehicles
- Memorize coupling and uncoupling sequences step by step
- Drill combination-vehicle-specific inspection and emergency scenarios
Mixed Review
- Run full-length practice sessions mixing all three domains
- Re-take any domain where scores sit close to the 80% line
This sequencing mirrors how the tests build on each other: General Knowledge first because it's foundational, Air Brakes second because most combination rigs require it, and Combination Vehicles last because it assumes comfort with the first two. For a fuller version of this approach with more detail on pacing, read the ID-CDL Study Guide 2026.
Test Day Mechanics
Knowing the format ahead of time removes a lot of the anxiety around the exam itself. All three knowledge tests are administered at county driver-licensing offices, and each is scored independently - you'll know immediately whether you cleared the 80% mark on that specific test. If you don't, you'll need to retest and pay the $5 fee again for that domain only.
The skills test is a separate event entirely, conducted by an ITD-approved examiner rather than county staff. Because the fee structure here is different - a $10 county fee plus up to $190 to the examiner - confirm exactly what's due and to whom before your appointment so there are no surprises at the counter.
If you're still gauging how demanding the process feels relative to other testing you've done, the How Hard Is the ID-CDL Exam? guide and the ID-CDL Pass Rate 2026 analysis both dig into what the data and candidate experience actually show.
After You Pass: What Comes Next
Passing all three knowledge tests gets you the permit-stage clearance, but the unrestricted Class A credential isn't final until the skills test is complete. Once you're licensed, the CDL opens doors across freight, logistics, and transport roles that specifically look for combination-vehicle-qualified drivers. If you're mapping out where this credential leads and what it's realistically worth pursuing, the ID-CDL Salary Guide 2026 and Is the ID-CDL Certification Worth It? ROI analysis are useful next reads, as is the overview of typical employers in ID-CDL Jobs.
For candidates who want structured instruction before attempting the knowledge or skills tests, reviewing options in ID-CDL Training can help you decide whether self-study with practice tests on our main practice test platform is enough, or whether formal Entry-Level Driver Training coursework should come first.
And if you're not entirely sure what sets this credential apart or want the plain-language basics before diving into fees and domains, start with What Is ID-CDL? or ID-CDL Meaning for context, then circle back here.
FAQ
Budget $29 for the commercial learner's permit, $5 per knowledge test (three tests for the unrestricted Class A path), and up to $200 for the skills test, which includes a $10 county fee plus up to $190 paid to the examiner.
Yes. General Knowledge, Air Brakes, and Combination Vehicles are all required for the unrestricted Class A path, and each must be passed at 80% or higher individually.
The CLP is valid for one year from the date of issue, so plan your knowledge and skills testing to fit comfortably within that window.
No. You must hold the CLP for at least 14 days and complete applicable Entry-Level Driver Training before the skills test can be scheduled.
County driver-licensing offices administer the knowledge tests, while ITD-approved examiners conduct the skills test, which is why fees and scheduling differ between the two stages.