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The common questions before you start studying for the CDL knowledge test. Still stuck? Contact support.
No. The CDL knowledge test is the written (computer) portion you take at the DMV to get your Commercial Learner's Permit — General Knowledge plus any endorsement sections you need. The skills/road test comes later. Koydo CDL prepares you for the knowledge test.
It varies by state and by which sections you take, but General Knowledge is typically 50 questions and most sections require about 80% correct to pass. Koydo focuses your practice on that pass threshold and scores you the same way so you know when you're ready.
All nine: General Knowledge, Air Brakes, Combination Vehicles, Hazardous Materials (HazMat), Doubles/Triples, Tanker, Passenger Transport, School Bus, and the Pre-Trip Inspection. You study only the sections your license class and endorsements require.
Yes. You get a set of free practice questions every day plus the General Knowledge section, and the sampler lets you try real questions with no account at all. Premium unlocks all nine sections, full mock exams, AI explanations, and parked-study audio.
The federal CDL standards are the same everywhere, but fees, minimum age, and permit rules differ by state. Koydo layers your state's specifics on top of the federal material, and every state page links to the official DMV source so you can confirm the details yourself.
Yes — Koydo CDL runs in any mobile browser, and there's a hands-free parked-audio mode that narrates each section so you can review in the cab or on a break without looking at the screen.
Every question is written by the Koydo editorial team and checked against official material: the FMCSA Commercial Driver's License program, the federal standards in 49 CFR Part 383, and each state's DMV manual — the same source of truth your DMV builds its test from. See the Sources & Methodology page for the full list.
No. Koydo CDL is an independent study aid and is not affiliated with or endorsed by the FMCSA, any state DMV, or any official testing authority. Use it to prepare, and always confirm current requirements with your state DMV before you test.