Make each study session count.

CDL Rule Changes Heading Into 2027

The federal CDL rules that affect you in 2027 — non-domiciled CDLs, English proficiency, the Clearinghouse, ELDT and the transit-bus waiver ending — with official sources.

How to Get a CDL in 2027

Federal steps to a CDL in 2027: age, the medical certificate, the 80 percent knowledge-test rule, the 14-day permit wait, entry-level driver training, and the skills-test order, with Texas, Florida, and New York fee examples.

The CDL Knowledge Test in 2027

What the CDL knowledge test covers, the federal 80 percent passing rule, retakes, language rules, and state examples from California, Texas, New York, and Pennsylvania, with official sources.

Best CDL Practice Test Apps for 2027

CDL Prep Hero is $8.99 for 90 days with no automatic renewal. Choose a state and practice the knowledge-test subjects. Other App Store CDL apps are listed by name and seller only.

How to study for the CDL permit test

Build a CDL permit-test study plan around your state manual, short practice sessions and an error log. Learn the explanation, not just the answer letter.

Turn missed CDL practice questions into a useful review plan

Use a practical error log to review wrong answers and lucky guesses, check your state manual, and choose your next CDL study session.

Use your CDL practice score to plan, not predict

Understand correct counts, short-quiz percentages, repeated attempts and CDL Prep Hero's 80% practice benchmark without mistaking them for an official result.

Choose what to practice next

A short quiz can help you choose your next reading topic. Understand correct counts, short-quiz percentages, repeated attempts and CDL Prep Hero's 80% practice benchmark without mistaking them for an official result. CDL Prep Hero's app includes visual lessons and progress tracking.

Start with state-specific practice: California, Iowa, Georgia, Idaho, Arizona, or browse all states.