California CDL Study Guide
Last updated: September 2026
How should I study for the California CDL test?
Start with the California Commercial Driver Handbook (DL-650), identify which knowledge tests you need, focus on high-value topics, review the key numbers, practice the concepts, and do a focused last-minute review.
Source: California Commercial Driver Handbook (DL-650)
How to Study for the California CDL Test
- Step 1
Identify the tests you need
Every applicant takes General Knowledge. Class A adds Combination Vehicles; air-braked vehicles add Air Brakes. Endorsements add their own tests.
- Step 2
Start with the official handbook
The California Commercial Driver Handbook (DL-650) is the source the test questions are drawn from. Use it as your base reference.
- Step 3
Focus on high-value topics
Prioritize the areas that cause the most confusion — air brake numbers, following distance, and inspection checkpoints.
- Step 4
Review numbers and rules
Lock in the exact figures and rules you'll be tested on, rather than re-reading everything.
- Step 5
Practice
Check your understanding with practice questions, and review what you get wrong.
- Step 6
Do a final focused review
Just before test day, review the high-value numbers and rules once more — not the entire handbook.
High-Value Topics to Review
These are the areas worth prioritizing when you study:
- General Knowledge
- Air Brakes
- Pre-Trip Inspection
- Combination Vehicles
- Key numbers
- Common exam traps and easily confused concepts
Numbers to Memorize
A few air brake numbers show up repeatedly. These are manufacturer-specified figures, so remember them as approximate values:
See the full set of air brake PSI numbers and the low air warning threshold.
Why a Short Study Guide Can Help
The official DL-650 handbook is the complete reference — and a short guide is not a replacement for it. What a focused guide does well is:
- Concentrate the high-value numbers and rules in one place.
- Give you a fast review instead of re-reading a full handbook.
- Serve as a last-minute refresher right before test day.
A short guide is a supplement, not a substitute for the official handbook.
What's in the California CDL Exam Sprint Guide
The California CDL Exam Sprint Guide is a 12-page pdf built for last-minute review. It concentrates the areas that are easy to forget:
Numbers • Air Brakes • Pre-Trip • Exam Traps
- Key numbers — PSI, inches, feet, and percentages.
- Air brake rules and the pressure gradient.
- Pre-trip inspection checkpoints.
- Common exam traps and easily confused concepts.
Related Resources
Frequently Asked Questions
What is the best way to study for the California CDL test?+
Start with the official DL-650 handbook, identify which tests you need, focus on high-value topics, review key numbers, practice, and do a focused final review.
Do I need to read the whole California CDL handbook?+
The handbook is the source of the test questions, so it's worth reviewing the sections that apply to you. A focused guide can help you review the high-value points without re-reading everything.
What numbers do I need to memorize for the CDL test?+
Air brake pressure values (cut-out, cut-in, low air warning, spring brakes), tire tread depth, following distance, and warning triangle placement are among the most common. See our Air Brake PSI page.
Is a short study guide enough to pass?+
No short guide can replace full preparation. A focused guide works best as a supplement and last-minute review — the official handbook remains your primary study source.
What is the California CDL Exam Sprint Guide?+
It's a 12-page PDF built for last-minute review. It concentrates the key numbers, air brake rules, pre-trip checkpoints, and exam traps in one place.
This page is an independent study resource. It is not affiliated with the California DMV. Verify current requirements against official sources.