Apps / CDL Hazmat Prep
CDL Hazmat Prep
SafetyLive on App StoreCDL Hazmat Prep is an iOS and Android app with 500+ original supplemental questions covering the shared federal H-endorsement scope, plus a placard guide with supported UN-number examples. It works offline; purchase terms are set by the app store. Use your state's current CDL manual for the official test format.
Available on iPhone and Android · Free to download · optional in-app purchases; check your store for current local terms
Official-source boundary
Verify your state's current H-endorsement process
States administer CDL knowledge tests and publish the current format. FMCSA requires at least 80% on knowledge and endorsement tests; first-time H applicants must complete required theory through a registered provider. VoltExam is supplemental practice and does not provide ELDT credit or predict an official result.
Federal boundary last reviewed 2026-09-06; sources rechecked for this page on 2026-10-18.
State-Manual-First CDL Hazmat Practice
DOT Placard Guide
DOT hazmat placard guide — all 9 hazard classes with threshold quantities and divisions
510+ Practice Questions
510 supplemental CDL hazmat questions covering the shared federal H-endorsement topic scope
Works Offline
Full offline access — works in the truck, terminal, or training center without Wi-Fi
Progress Tracking
Per-topic progress tracking across all CDL hazmat endorsement test categories
What’s on the CDL Hazmat Exam?
These are shared federal study areas, not state exam weights. Use your current state CDL manual for its complete test-preparation scope.
How It Works
Step 01
Download Free
Free to download on iPhone and Android. Optional purchases use the terms shown in your store.
Step 02
Practice Daily
Built-in DOT Placard Guide plus full practice questions — not just quizzes.
Step 03
Unlock Full Practice
Choose only from the purchase options and terms displayed by your app store.
Native app purchase options
Apple App Store
The public listing describes a 3-day free trial and optional in-app purchases. Open the App Store for the current price, eligibility, and renewal terms shown for your region and account.
Google Play
Google Play lists the app as free to install with in-app purchases. Review the purchase terms and final local price in Google Play before confirming.
Native app purchases are separate from VoltExam web access. The public native listing and the separate 510-question web practice bank are different product surfaces; check each destination for its current content and terms.
Frequently Asked Questions
How many questions are on the CDL hazmat endorsement test?
Your state publishes the current H-endorsement question count and time limit. FMCSA requires at least 80% on CDL knowledge and endorsement tests. Use your state's current CDL manual or testing page for the complete format.
Do I need a TSA background check for the hazmat endorsement?
The H endorsement requires a TSA Security Threat Assessment. Confirm the current enrollment sequence, fee, locations, and processing guidance on TSA's official Hazmat Endorsement page before planning your test date.
How long does a CDL hazmat endorsement last?
Renewal timing and state steps depend on your jurisdiction. Check both your state licensing agency and TSA's official Hazmat Endorsement page for the current renewal sequence.
What score do I need to pass the hazmat endorsement test?
FMCSA requires at least 80% on CDL knowledge and endorsement tests. The number of correct answers depends on the question count set by your state. A VoltExam practice score identifies review topics; it does not predict the official result.
Study for Your CDL Hazmat Endorsement
Free to download. 510 supplemental questions and a placard guide; review current purchase terms in your app store.
Free Web Tools
Free CDL Hazmat Prep Practice Questions
Browse topic-by-topic in your browser — no app required
Free Study Hub — Web App
Read the guide, memorize with flashcards, and test yourself — all in your browser, no download required.
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