CDL endorsement practice tests
Each endorsement on a commercial driver license has its own written test. The rules behind them are federal, set by the FMCSA, so the questions are the same in every state. Take the general knowledge test of your state first; then the endorsements for the vehicle you will drive.
General Knowledge
The first CDL test, with your state's own rules.
Air Brakes
You drive a commercial vehicle with air brakes.
Combination Vehicles
You pull a trailer with a tractor unit, Class A.
Hazardous Materials (H)
You haul placarded hazardous materials.
Tank Vehicles (N)
You haul liquid or gas in a tank.
Doubles and Triples (T)
You pull more than one trailer.
Passenger Transport (P)
You carry passengers, such as in a bus or a van.
School Bus (S)
You drive a school bus, on top of the passenger endorsement.