Free Missouri CDL Practice Test
Missouri uses the national CDL manual and federal question pool. Practice every knowledge test here, then check Missouri’s own question counts, passing scores and fees below.
General Knowledge and every endorsement test at the length states use, three answer choices per question, scored at the real 80% pass mark with an explanation from the CDL manual for every answer.
Or start with a free 10-question drillWhat minimum tread depth does the manual require in every major groove on front tires?
Missouri CDL knowledge tests
| Test | Questions | Correct to pass | Practice |
|---|---|---|---|
| General Knowledge | 50 | 40 | General Knowledge practice |
| Air Brakes | 25 | 20 | Air Brakes practice |
| Combination Vehicles | 20 | 16 | Combination Vehicles practice |
| Hazardous Materials | 30 | 24 | Hazardous Materials practice |
| Tank Vehicles | 20 | 16 | Tank Vehicles practice |
| Doubles and Triples | 20 | 16 | Doubles and Triples practice |
| Passenger Transport | 20 | 16 | Passenger Transport practice |
| School Bus | 20 | 16 | School Bus practice |
Practice before your MO knowledge tests
General Knowledge and every endorsement test at the length states use, three answer choices per question, scored at the real 80% pass mark with an explanation from the CDL manual for every answer.
Or start with a free 10-question drillTaking the tests in Missouri
- Where
- At Missouri State Highway Patrol driver examination locations. Written exams are in English only, and interpreters are not allowed.
- Commercial learner’s permit
- Issued for up to one year (360 days), depending on lawful status, and it cannot be renewed. If you need more time, you test again.
- Good to know
- Missouri sets its test lengths in state rule 12 CSR 10-24.300: 50 General Knowledge questions and 20 to 30 for each endorsement test, 80% to pass.
Missouri CDL fees
- Commercial learner’s permit, total: $44
- of which written examination fee: $25
- of which permit transaction fee: $10
- of which office processing fee: $9
Missouri CDL test questions
How many questions are on the Missouri CDL permit test?
The Missouri General Knowledge test has 50 questions and you need 40 correct. Air Brakes: 25 questions, 20 to pass; Combination Vehicles: 20 questions, 16 to pass; Hazardous Materials: 30 questions, 24 to pass; Tank Vehicles: 20 questions, 16 to pass; Doubles and Triples: 20 questions, 16 to pass; Passenger Transport: 20 questions, 16 to pass; School Bus: 20 questions, 16 to pass.
Where do I take the CDL knowledge tests in Missouri?
At Missouri State Highway Patrol driver examination locations. Written exams are in English only, and interpreters are not allowed.
How much does a Missouri CDL permit cost?
the Missouri Department of Revenue lists: Commercial learner’s permit, total $44; of which written examination fee $25; of which permit transaction fee $10; of which office processing fee $9.
Ready for the knowledge tests?
General Knowledge and every endorsement test at the length states use, three answer choices per question, scored at the real 80% pass mark with an explanation from the CDL manual for every answer.
Or start with a free 10-question drillMore CDL practice
- CDL General Knowledge practice test
- CDL Air Brakes practice test
- CDL Combination Vehicles practice test
- CDL Hazardous Materials practice test
- CDL Tank Vehicles practice test
- CDL Doubles and Triples practice test
- CDL Passenger Transport practice test
- CDL School Bus practice test
- Illinois CDL practice test
- Pennsylvania CDL practice test
- Michigan CDL practice test
- Washington CDL practice test
Missouri facts are from the Missouri Department of Revenue, checked October 2026: 12 CSR 10-24.300 CDL written examinations · Missouri DOR: commercial drivers · Missouri CDL Manual.
Original independent practice. Not affiliated with or endorsed by the Missouri Department of Revenue, FMCSA or AAMVA.