Pick how many questions, answer at your own pace, and get instant explanations. Use 80% as the federal knowledge-test minimum and confirm your state format.
Start with your current state CDL manual.
States administer the Hazmat knowledge test, so confirm the test length, timing, process, and current study material with your licensing agency. Federal rules require at least 80% on CDL knowledge tests. If you are seeking the H endorsement for the first time, complete the required ELDT theory training before the knowledge test. VoltExam is supplemental practice; it is not an ELDT provider or a substitute for your state manual. The 2024 ERG is a separate emergency-response reference, not your state test blueprint.
Find your state CDL manual FMCSA ELDT requirements PHMSA ERG 2024 (reviewed 2026-09-06)