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State-specific CDL prep
Pass Your
CDL Knowledge
Test
Start with 15 free CDL questions, then unlock state-specific practice, missed-answer explanations, mock exams, and parked-study audio before test day.
15 free questions to startAll 50 states9 CDL sectionsMissed-answer review
Study aid only. Always confirm official requirements with your state DMV.
50
States covered
9
CDL sections
80%
Pass-threshold focus
Mock
Exam simulation
Study Every CDL Knowledge Section
Cover the required core tests plus endorsement sections before test day
Built To Get You Ready Before Test Day
State-specific practice, explanations, mock exams, and pre-trip support in one study flow
State-Specific Practice
Pick your CDL state and study the questions, rules, and exam framing that match where you plan to test.
80% Pass Focus
CDL knowledge tests generally require 80% to pass. Koydo keeps practice centered on that threshold.
Mock Exam Mode
Take a timed mock exam before test day, then review where your score is strong and where you still need reps.
Missed-Answer Review
Use explanations, favorites, and recently wrong review to spend the next study session on the mistakes that matter.
Full Section Coverage
Study General Knowledge, Air Brakes, Combination Vehicles, endorsements, and pre-trip in one CDL flow.
Parked-Study Audio
Use pre-trip and review audio when parked, on break, or off the road. Multilingual audio is the differentiator, not the first hook.
Pre-Trip Audio When You're Parked
Review narrated CDL material only when parked, on break, or off the road. The audio layer helps drivers study in the language they understand best after they have their pass strategy in place.
Read Study GuideAll 9 CDL sections
Adjustable speed
Use while parked
Premium access
Your Road to a CDL
Three practical study steps before your official test
📚
STEP 01Pick Your State
Start with the state selector so state-rules questions match where you will test.
🎯
STEP 02Practice by Section
Work through General Knowledge, endorsements, pre-trip, and recently wrong review.
🏆
STEP 03Run the Mock Exam
Use the mock exam and review missed topics before scheduling or taking the official knowledge test.
Ready To Start CDL Practice?
Start with 15 free questions, then unlock state rules, missed-answer review, mock exams, pre-trip coverage, and parked-study audio.
View CDL PlansFree starter practice available. Premium unlocks the full CDL study system when you are ready.