You already have the study material. Your state gave it to you free. It runs well past a hundred pages, it is written the way regulations are written, and you have read parts of it twice without keeping much of it.

That is not a failure of effort. It is a failure of the document. It was written to be complete, not to be learned from.

This book is that same material, decoded.

THREE TESTS, TAUGHT SEPARATELY

A Class A applicant sits three written tests: General Knowledge, Air Brakes and Combination Vehicles. They are sat and scored separately, and you can pass one and fail another on the same morning. Most guides blend them into one pile of facts. This one never does. Every chapter opens by naming which of the three its material belongs to, and every answer carries the same tag. If you are not sitting a test, you can skip its chapters and lose nothing.

EVERY NUMBER IN A TABLE

These tests are built on thresholds - psi, feet, seconds, inches, pounds, hours - and the manual states them mid-paragraph, scattered across the document. Here they are tabled as they are taught, then collected at the back in one page you can photograph. None of these numbers is hard on its own. The trouble is the pairs that look alike - 60 psi and 55 psi, four seconds and five - so this book teaches those as pairs, side by side, with the one thing that tells them apart.

EVERY RULE IN THREE PARTS

The number the test turns on. The steps, in the order you do them. And the reason it exists - the part nearly every guide skips, and the part that makes it stick. Every answer explanation says which of the three decided the question.

PRACTICE AT THE REAL BAR

The bar is 80 percent, and the practice tests here are scored at it and tell you plainly whether you passed - in questions, not percentages: 40 of 50 on General Knowledge, 20 of 25 on Air Brakes, 16 of 20 on Combination Vehicles. And no chapter here assumes this is your first attempt: if you have already sat one of the three and come up short, nothing is written as though you had not.

WHAT IS INSIDE - COUNTED, NOT ESTIMATED

- 14 teaching chapters, 119 tables and 5 diagrams
- 465 practice questions: 130 at chapter ends, 335 in full-length tests
- 10 full-length practice tests: 4 General Knowledge (50 questions each), 3 Air Brakes (25 each), 3 Combination Vehicles (20 each)
- Answer explanations that are mini-lessons: each names the right answer and every wrong option by letter, and what that other number you nearly picked actually governs
- Five reference sections: every number in one place, the pairs people mix up, how your state differs, a glossary, and test day including what happens if you fail

NATIONAL, AND WHAT YOUR STATE STILL DECIDES

What these tests may cover is federal: twenty General Knowledge areas, seven for Air Brakes, three for Combination Vehicles. Your state builds its test on that list, so this book is written to the federal standard, not to one state's handbook.

The 80 percent pass mark is federal too, and it does not change. The number of questions is not: your state sets it. Rather than print a figure and hope, we read ten states' own published rules: about half publish no General Knowledge count at all, and among those that do, the same test runs anywhere from 30 questions to 70. So this book will not tell you how long your test is. It tells you the bar, and to confirm the count, the fee and the retake rules with your state licensing agency. The practice tests here are 50, 25 and 20 because a full-length test needs a length, not because yours will be.

You do not have to read that manual again - only the parts of it the tests ask about, in an order you can keep hold of. That is what this book is.

Written for the 2026-2027 CDL knowledge tests.