Missouri CDL practice test
Published Updated Licensing sources checked:
How do I prepare for the Missouri CDL knowledge test?
If you are preparing for your first permit, start with general knowledge and the official Missouri instructions below. If your vehicle needs air brakes or combination vehicles, add those federal study sets; for hazardous materials, use the separate hazmat set. Compare the state’s published test rules with its current manual before you test. These practice sets teach federal topics and do not copy the state exam.
This page is study material. It is not the Missouri state exam, and it does not copy state test questions. Check the official Missouri pages below before you test.
| Your situation | Start with… |
|---|---|
| A quick first try | Take a 10-question warm-up |
| Ready for a longer attempt | Take the 50-question general knowledge exam |
| Need state rules or documents | Check the Missouri application steps |
Missouri commercial driver manual (PDF) — link checked . Study its rules alongside our federal-standard bank. Our 50-question exam length is a study setting; use the official counts below for Missouri.
Missouri DOR’s commercial manual, checked November 11, 2026, prints the test counts below in its CDL Written Examinations table and requires 80 percent on each exam. Use DOR for permit issuance and fees and the Missouri State Highway Patrol for testing. Our federal study sets do not reproduce Missouri exam questions.
Which tests do I need in Missouri?
| Your vehicle or work | Required study and tests |
|---|---|
| All permit applicants | Start with general knowledge. Official requirements. Federal warm-up · Federal exam mode |
| Class A combination vehicle | Add combination vehicles. Official requirements. Federal warm-up · Federal exam mode |
| Vehicle with air brakes | Add air brakes and check restriction rules. Official requirements. Federal warm-up · Federal exam mode |
| Passenger vehicle | Add the passenger endorsement tests. Official requirements. Federal warm-up · Federal exam mode |
| School bus | Study school bus and passenger topics; check state testing requirements. Official requirements. Federal warm-up · Federal exam mode |
| Tank vehicle | Add the tank vehicle knowledge test. Official requirements. Federal warm-up · Federal exam mode |
| Hazardous materials | Add the hazmat knowledge test and check approval and training steps. Official requirements. Federal warm-up · Federal exam mode |
| Doubles or triples | Add the doubles and triples knowledge test; check state vehicle limits. Official requirements. Federal warm-up · Federal exam mode |
Use the commercial manual’s CDL table. The Highway Patrol FAQ’s separate operator, for-hire and motorcycle question counts do not describe the CDL exam. Check school bus and hazmat requirements before booking.
Before booking the exam, check Missouri CDL application steps and official fee lines.
| Test | Questions | To pass | Official source |
|---|---|---|---|
| General knowledge | 50 questions | 80 percent | State source |
| Combination vehicles, for Class A | 20 questions | 80 percent | State source |
| Air brakes, if applicable | 25 questions | 80 percent | State source |
| Passenger | 20 questions | 80 percent | State source |
| Tank vehicle | 20 questions | 80 percent | State source |
| School bus | 20 questions | 80 percent | State source |
| Hazardous materials | 30 questions | 80 percent | State source |
| Doubles and triples | 20 questions | 80 percent | State source |
Missouri language, permit and booking notes — checked 2026-11-11
DOR’s current application page lists a $44 CLP fee: $25 written examination fee, $10 permit transaction fee and $9 office processing fee. This booking note uses the web page’s current processing fee rather than the older manual fee table. Official source — checked .
The Highway Patrol FAQ says written tests need no appointment; CDL skills tests require one. Check the station’s testing days and hours before visiting. Official source — checked .
DOR and the Highway Patrol say CDL written testing, including school bus, is English only. DOR says translators are not allowed for the knowledge test. Official sourceOfficial source — checked .
The manual requires electronic verification of applicable Entry-Level Driver Training before hazardous-materials knowledge testing. DOR requires a CLP to be held at least 14 days before skills testing. Official sourceOfficial source — checked .
For unknown figures, check with the Missouri licensing agency. A blank count is not an estimate.
Federal study sets, not the Missouri exam
Use general knowledge, air brakes, combination vehicles, and hazmat to study the federal topics. Finishing one of those sets does not mean you passed the Missouri test.