Using the state manual

The manual is the source

Your knowledge test questions are written from your state's commercial driver licence manual. Not from a study guide, not from an app, and not from this site. One document, published by the agency that administers your test, available free.

That has a direct consequence for how to study. Anything that disagrees with your manual is wrong for your test, including material that is correct elsewhere. The content areas are federal and shared, but each state writes its own questions from its own manual, which is why a confident answer from a forum is worth less than a paragraph you can point to.

Download the current version from your state licensing agency rather than a copy hosted elsewhere. Manuals are revised, and an out-of-date PDF circulating on a third-party site is a common and avoidable problem.

Read only the sections that apply to you

The manual is long, and most people who bounce off it do so because they opened page one and began reading toward page three hundred. Most of it does not apply to you.

Work out which tests you actually need first, then read only those sections. General knowledge applies to everyone. Air brakes applies to most. Combination vehicles applies to a class rather than to everyone. The endorsement sections apply only if you want that letter.

The router on the home page resolves this from what you intend to drive and carry, and the requirement matrix shows which tests each class and cargo type needs. Take that list to the manual's contents page and read those chapters only.

The classes guide covers what separates A, B and C if you are not yet sure which you are aiming at.

How to read it so it sticks

Read a section, then answer questions on it. Reading three chapters and then testing yourself is much less effective than alternating. Retrieval is what fixes the material, not exposure.

Notice which parts are procedures. Inspection routines, coupling and uncoupling, air brake checks — these are sequences, and sequences are tested on order as much as content. They also reappear in the skills test, so learning them properly pays twice.

Mark anything with a number in it. Distances, pressures, weights and times are disproportionately represented in questions, because they are unambiguous to test. They are also the part most likely to differ from another state's manual.

When you get something wrong, go back to the paragraph. Not to the explanation in an app — to the manual's own wording. That habit turns a wrong answer into a fixed one, and it is why every item in the banks here carries its explanation rather than just a right answer.

What practice questions are for

They are a diagnostic, not a substitute. Their job is to tell you which sections of the manual you have not learned yet, so you can go back to those and not to the whole thing.

This is why this site gives you a raw correct count per test rather than a predicted pass or a percentage. A practice bank cannot know your state's cut score or its question pool, so any number presented as a likelihood of passing has been made up. The count tells you where the gaps are, which is the thing that is actually useful.

Every bank here is free in full, with the explanation on every item, and nothing you answer leaves your browser.

Where to get yours

From your own state licensing agency, which is also the authority for the fees, the appointment process and the rules around your permit. The state pages are the starting point.

These questions are written to the federal knowledge areas every state is required to test. They are not your state's questions — no free site has those. Your state writes its own test from its own CDL manual, and that manual is the thing to study.

Editor's notes

Written by CDL Practice Free about the piece above — not reader submissions.

Common questions