How many CDL practice questions should I do for Illinois?

Practice until you're consistently scoring well above 80% on all the tests you need. The federal passing standard is 80% for every CDL knowledge test, and Illinois follows that requirement. Most students need several rounds of practice to build confidence and fill knowledge gaps.

Where is Illinois's official CDL manual?

Illinois's CDL manual is published by Illinois Secretary of State. You can access it through the official link on this page. The manual is the primary study resource for your state's CDL knowledge tests.

Are these practice tests specific to Illinois?

The practice questions on this site cover the federal CDL standards that apply in every state, including Illinois. The federal passing standard (80% under 49 CFR 383.135) is the same nationwide. While states administer their own tests and may have different question counts or testing procedures, the core knowledge requirements are consistent.

Illinois CDL practice test

Free CDL practice tests for all 8 topics, plus Illinois's official CDL manual and directory of 126 FMCSA-registered training locations.

Illinois CDL manual and licensing agency

The official Illinois CDL manual is published by Illinois Secretary of State. Study your state's manual as your primary resource — it covers the federal CDL standards and may include Illinois-specific information about testing procedures or application steps.

Illinois Illinois Secretary of State homepage

For official licensing decisions, eligibility requirements, test fees, and scheduling your knowledge or skills test, contact Illinois Secretary of State directly.

Free CDL practice tests

These practice tests cover the federal CDL standards that apply in Illinois and every other state. The federal passing standard is 80% for all CDL knowledge tests under 49 CFR 383.135.

Core CDL tests

Most drivers need General Knowledge (everyone), Air Brakes (if your vehicle has air brakes), and Combination Vehicles (for Class A).

CDL endorsement tests

Add a test for each endorsement you want on your CDL.

Every question includes a detailed explanation, so when you miss one, you know exactly what to review. For study strategy and tips, see our guide on how to study for the CDL permit test. Federal steps and the 2027 rule summary are in how to get a CDL in 2027 and the CDL knowledge test in 2027.

Get the full CDL course on your phone

Visual lessons, mock exams, and a progress score to help plan your next study session. Free to start on iPhone and Android.

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CDL schools in Illinois

Federal law requires Entry-Level Driver Training (ELDT) for most CDL applicants obtaining a Class A or Class B CDL for the first time, upgrading from Class B to Class A, or adding a hazmat (H), passenger (P), or school bus (S) endorsement for the first time. Training must be completed with an FMCSA-registered provider before taking the skills test.

Training in major Illinois cities

126 FMCSA-registered CDL training locations operate in Illinois. Browse them by city, or filter by training type:

To check if a specific school is registered, use the CDL school lookup.

Preparing for the Illinois CDL skills test

After you pass the knowledge tests and complete ELDT training, you'll take the CDL skills test, which has three parts: the pre-trip vehicle inspection, basic vehicle control, and the on-road driving test.

Start with our CDL pre-trip inspection guide, which covers the vehicle inspection portion that every CDL applicant demonstrates.

Frequently asked questions

How many CDL practice questions should I do for Illinois?: Practice until you're consistently scoring well above 80% on all the tests you need. The federal passing standard is 80% for every CDL knowledge test, and Illinois follows that requirement. Most students need several rounds of practice to build confidence and fill knowledge gaps.
Where is Illinois's official CDL manual?: Illinois's CDL manual is published by Illinois Secretary of State. You can access it through the official link on this page. The manual is the primary study resource for your state's CDL knowledge tests.
Do I need ELDT training in Illinois?: Entry-Level Driver Training (ELDT) is a federal requirement under 49 CFR 380. Illinois follows this requirement. ELDT is required for most applicants obtaining a Class A or Class B CDL for the first time, upgrading from Class B to Class A, or adding a hazmat, passenger, or school bus endorsement for the first time. Training must be completed with an FMCSA-registered provider before taking the skills test.
Are these practice tests specific to Illinois?: The practice questions on this site cover the federal CDL standards that apply in every state, including Illinois. The federal passing standard (80% under 49 CFR 383.135) is the same nationwide. While states administer their own tests and may have different question counts or testing procedures, the core knowledge requirements are consistent.

Related states and resources

CDL practice tests for neighboring states

Other resources

CDL practice test by state
CDL manuals for all 50 states and DC
Free CDL practice tests for all 8 knowledge test topics
CDL schools directory — browse all FMCSA-registered training providers
Pre-trip inspection guide for the CDL skills test

Not affiliated with Illinois Secretary of State

CDL Prep Hero is an independent study resource operated by Evergreen Comply, LLC. We are not affiliated with Illinois Secretary of State or any other state licensing agency. For official licensing decisions, eligibility questions, fees, or test appointments, contact Illinois Secretary of State directly.