Free Illinois CDL practice test with real commercial driving questions. Prepare for your Illinois CDL exam — General Knowledge, Air Brakes, HazMat, and all endorsements. Updated for 2026.
The Illinois Secretary of State CDL knowledge test has 50 questions for General Knowledge, with additional 20–30 question tests for each endorsement (Air Brakes, HazMat, Tanker, etc.). You need 80% to pass each section. Illinois tests are administered by the Secretary of State — not a DMV — at offices statewide.
The Illinois Secretary of State knowledge exam tests your understanding of Illinois traffic laws, road signs, and safe driving practices. DriveAce covers every topic you'll encounter on test day.
Vehicle inspection, cargo management, driving techniques, and documentation for Illinois CDL.
Air brake system components, inspection, emergency stops, and maintenance tested by the Illinois Secretary of State.
Hazardous materials classification, placarding, loading/unloading rules for Illinois CDL endorsement.
Liquid surge, rollover prevention, loading and unloading procedures for Illinois tanker endorsement.
Coupling, uncoupling, stability, and safe driving with multiple trailers under Illinois CDL rules.
Passenger safety, school bus operations, railroad crossings, evacuation for Illinois CDL.
The Illinois Secretary of State CDL General Knowledge test has 50 questions. You need 80% (40 correct) to pass. Each CDL endorsement — Air Brakes, HazMat, Tanker, Doubles/Triples, Passenger, School Bus — has an additional 20–30 question test, each also requiring 80%.
DriveAce covers all major Illinois CDL endorsements: General Knowledge, Air Brakes, HazMat (Hazardous Materials), Tanker Vehicles, Doubles/Triples, Passenger Vehicles, and School Bus. All practice questions are based on Illinois Secretary of State CDL requirements.
Yes — DriveAce offers free CDL practice questions for Illinois. Study General Knowledge and endorsement-specific questions that mirror the real Illinois Secretary of State CDL exam. Full access to all practice questions is available for a one-time $19.99 fee.
You need to score 80% on the Illinois CDL General Knowledge test and each endorsement test. DriveAce practice tests use the same 80% passing threshold, so you always know when you're ready for the real exam at the Illinois Secretary of State.
Join thousands of drivers who passed their Illinois CDL exam on the first try with DriveAce. No subscription. No ads. Just the knowledge you need.
Start Free Practice Test →$19.99 one-time for full access. 20 free questions included.