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English
English CDL prep
app.koydo.cdl1,577 English study prompts, 50-state coverage, mock exams, and parked-study audio.
National English CDL prep with state-rule questions layered on top of FMCSA-based content.
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Prepare for General Knowledge, Air Brakes, Combination Vehicles, HazMat, Tanker, Passenger, School Bus, Doubles/Triples, Pre-trip Inspection, and state-rule questions with a CDL app built for short, focused study sessions.
$25 for six months • Premium access required before study content opens • Independent study aid — not affiliated with or endorsed by any DMV or official testing authority.
Pick one language, then open the matching Koydo CDL app page. Each app is a separate native-language build with the same premium CDL course.
Selected app
English CDL prep
app.koydo.cdl1,577 English study prompts, 50-state coverage, mock exams, and parked-study audio.
National English CDL prep with state-rule questions layered on top of FMCSA-based content.
Mobile app parity
Pre-trip inspection
Which emergency equipment should a CMV driver verify during pre-trip inspection?
The English CDL build is focused on launch readiness: real study banks, state selection, placement, mock exams, parked-study review, favorites, reminders, and transparent premium access.
Choose your state and Koydo adds state-rule prompts on top of federal FMCSA-based CDL knowledge, so learners see both the national rules and local DMV expectations.
Audio study is designed for parked review and hands-free study sessions before or after a shift, never for active driving.
Practice General Knowledge, Air Brakes, Combination Vehicles, HazMat, Tanker, Passenger, School Bus, Doubles/Triples, and Pre-trip Inspection questions.
Timed 50-question mock exams, pass/fail scoring, completion summaries, and readiness checks match the pressure of test day.
Star hard questions, automatically revisit missed answers, and use short focused sessions instead of scrolling a giant bank.
$25 for six months unlocks the CDL course, section tests, study materials, audio, reminders, favorites, and progress tracking.
The core CDL knowledge test is based on federal FMCSA rules, but states can add local procedures, fees, forms, medical-card handling, retest rules, and state-specific wording. Koydo layers 50-state rule prompts on top of the federal CDL bank.
Yes. Koydo CDL includes a dedicated pre-trip inspection bank alongside General Knowledge, Air Brakes, Combination Vehicles, HazMat, Tanker, Passenger, School Bus, and Doubles/Triples.
No. Koydo CDL is a study app. Parked-study audio and voice-friendly review are intended only when you are parked, off duty, or otherwise able to study safely.