- Group A requires three separate exams: 70-question General Knowledge, 20-question Combination Vehicles, 25-question Air Brakes.
- Every test demands an 80% passing score, and you get only one attempt per category per day.
- A first-time CDL costs $25; each added group or endorsement adds $5.
- Your CLP must be held at least 14 days before you can schedule the skills test.
Quick Facts Snapshot
If you need the whole Michigan CDL Permit Test process boiled down to one screen, this is it. The Michigan Department of State runs the knowledge tests at Secretary of State computer testing stations, while the hands-on skills test happens through an approved driver testing business. That split matters: you can't finish everything in one visit, so plan your schedule around two separate steps.
For a deeper breakdown of what each number means for your study plan, see the MI-CDL Passing Score 2026 guide, and for the full domain walkthrough, check the MI-CDL Exam Domains 2026 complete guide.
The Three Tests You'll Actually Take
Candidates often assume "the CDL test" is a single exam. It isn't. Michigan's Group A path is built from three distinct, separately scored tests, and each one has its own question count and its own 80% threshold:
- Group A Knowledge Test - 70 questions covering general trucking knowledge, safety procedures, and vehicle inspection basics.
- Combination Vehicles Test - 20 questions specific to coupling, uncoupling, and handling multi-unit rigs.
- Air Brakes Test - 25 questions on air brake systems, which you need if your vehicle is equipped with them (most Group A trucks are).
Because these are graded independently, you can pass one and fail another on the same day - and if you do fail one, you can't retake that specific category again until the next day. This structure is why generic "CDL prep" content misses the mark; you need to study each test as its own unit, not as one blended pool of trivia.
General Knowledge
This is the foundation test every Group A applicant takes. It covers the broadest range of material and carries the most questions of the three.
- Vehicle inspection sequences and what examiners look for
- Basic safe-driving procedures for commercial vehicles
- Documentation and general operating rules
Air Brakes
A shorter test, but a strict one - miss the concepts here and you can't legally drive an air-brake-equipped combination vehicle without restriction.
- How the air brake system builds and releases pressure
- Warning signals and what to do when they trigger
- Pre-trip inspection points unique to air brake systems
Combination Vehicles
The smallest question count of the three, but it's tested precisely because combination rigs behave very differently from straight trucks.
- Coupling and uncoupling procedures in the correct order
- How combination vehicles handle differently in turns and stops
- Inspection items specific to trailers and connections
Want a chapter-by-chapter view of what's inside each of these three areas? The MI-CDL Exam Domains 2026 guide walks through every content area in more detail than this cheat sheet allows.
Fees and Registration Mechanics
Michigan keeps the fee structure simple, but the details trip people up when they're budgeting for endorsements they didn't plan for.
| Item | Cost |
|---|---|
| First-time standard CDL | $25 |
| Each additional standard group designation | $5 |
| Each additional endorsement | $5 |
That means the base Group A path itself doesn't have hidden per-test fees baked into these numbers - the $25 covers your standard CDL, and anything you stack on top (an extra group designation or an endorsement) is a flat $5 add-on. For a full cost breakdown including how these fees interact with retesting and scheduling, read the MI-CDL Certification Cost 2026 pricing breakdown.
Key Takeaway
Budget for the base $25 credential plus $5 for every endorsement or group you're adding - don't assume a flat "one price" covers everything.
Eligibility Checklist
Before you can even sit down at a testing station, Michigan wants your paperwork in order. Here's what's non-negotiable:
- A valid Michigan driver's license
- Proof of legal presence and Social Security documentation
- Medical self-certification, when applicable to your driving category
- Minimum age 18 for intrastate driving; minimum age 21 for interstate driving or placarded HazMat operation
- Completion of applicable Entry-Level Driver Training (ELDT) before testing
The age split is one of the most commonly misunderstood rules - an 18-year-old can legally hold a CDL and drive within Michigan, but crossing state lines or hauling placarded hazardous materials requires waiting until 21. If you're mapping out your exact eligibility path, the MI-CDL Requirements 2026 eligibility guide covers every prerequisite in depth.
Domain-by-Domain Cheat Sheet
Here's the fastest way to keep the three domains straight when you're doing last-minute review the night before test day.
Domain 1: General Knowledge
This is your broadest and heaviest-weighted test at 70 questions. Treat it as the backbone of your prep - most other Group A knowledge builds on concepts introduced here.
- Review vehicle inspection order start to finish
- Memorize safe-following and space-management principles
- Know required documentation before and during a trip
Domain 2: Air Brakes
25 questions, but every one counts toward that same 80% bar. Air brake failures are a common real-world hazard, which is why Michigan tests this separately from general knowledge.
- Understand dual air brake systems and low-pressure warnings
- Know the difference between service brakes and parking brakes on air systems
- Practice explaining the air brake check aloud as part of your inspection routine
Domain 3: Combination Vehicles
Only 20 questions, but this is the domain most likely to catch straight-truck drivers off guard, since combination handling is a different skill set entirely.
- Practice the coupling sequence until it's automatic
- Study how trailer length and weight distribution affect stopping
- Know what to inspect at the fifth wheel and connection points
For a side-by-side comparison of how these three domains differ in scope and difficulty, the How Hard Is the MI-CDL Exam? difficulty guide is worth reading before test day.
14-Day Timeline After Your CLP
Michigan requires your commercial learner's permit (CLP) to be held for at least 14 days before you're eligible for the skills test. Rather than treating that wait as dead time, use it as a built-in study window split across your three knowledge domains.
General Knowledge Focus
- Work through inspection procedures and safe-driving rules daily
- Take practice questions modeled on the 70-question format
Air Brakes Focus
- Study air brake system diagrams and warning sequences
- Drill the 25-question format until answers feel automatic
Combination Vehicles Focus
- Master coupling/uncoupling order and trailer inspection points
- Run through the 20-question format under time pressure
Full Review and Booking
- Mix questions across all three domains to simulate test-day switching
- Confirm ELDT completion and schedule your skills test
This sequencing lines up naturally with the 14-day CLP hold - by the time you're eligible for the skills test, you've already cycled through every knowledge domain at least once. For a more detailed week-by-week plan, see the full MI-CDL Study Guide 2026 first-attempt strategy.
One Test Per Category Per Day
This rule deserves its own section because it changes how you should approach test day logistics. Michigan allows only one attempt per test category per day. If you fail the Air Brakes test in the morning, you cannot retake Air Brakes that same afternoon - you'll need to come back another day.
This also means a single bad day doesn't have to derail your whole timeline - you can still pass the other two categories and only need to return for a retest on the one you missed. If you're curious how this affects overall outcomes, the MI-CDL Pass Rate 2026 data breakdown discusses what the numbers actually show.
Who Hires MI-CDL Holders
An unrestricted Group A credential with the Combination Vehicles and Air Brakes categories cleared opens doors across freight, logistics, and delivery operations that specifically need drivers capable of handling multi-unit rigs equipped with air brake systems. Employers screening applicants typically want confirmation that all three knowledge areas were passed together, since that combination signals readiness for standard tractor-trailer operation rather than a restricted vehicle type.
If you're weighing whether the time and $25-plus-endorsement investment pays off for your career goals, the Is the MI-CDL Certification Worth It? ROI analysis and the MI-CDL Salary Guide 2026 earnings analysis both dig into that question. And once you're licensed, browsing MI-CDL Jobs is a practical next step for understanding what employers actually list as requirements.
Key Takeaway
Passing all three tests together - not just General Knowledge - is what makes your credential attractive for standard Group A combination-vehicle roles.
Where This Cheat Sheet Fits Into Your Prep
This page is meant as a quick-reference summary, not a substitute for full practice. Pair it with structured practice questions on the main practice test site so you're not just reading facts but actually answering questions in each format - 70-question General Knowledge sets, 20-question Combination Vehicles sets, and 25-question Air Brakes sets.
If any of the terminology here still feels unfamiliar - what the credential covers, how it's structured, or what the letters even stand for - start with the basics in What Is MI-CDL? or MI-CDL Meaning before diving into domain-level study. For scheduling specifics, including how testing station availability works, the MI-CDL Exam Dates 2026 scheduling guide covers windows and deadlines in more depth than this summary can.
Once you've got the fee structure and domain breakdown memorized from this cheat sheet, return to the practice test platform and run a full-length simulation of each category before booking your actual test date.
Frequently Asked Questions
The Group A knowledge test itself has 70 questions. Separately, you'll also take a 20-question Combination Vehicles test and a 25-question Air Brakes test if pursuing the unrestricted Group A path.
Every test - General Knowledge, Combination Vehicles, and Air Brakes - requires a score of 80% or higher to pass.
No. Michigan allows only one test attempt per category per day, so a failed test must be retaken on a different day.
A first-time standard CDL costs $25, and each additional standard group designation or endorsement adds $5 to that base fee.
You must hold your commercial learner's permit for at least 14 days before you're eligible to schedule and take the skills test.