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F1 practice questions - frequently asked questions

Plain answers about how F1 Exam Prep works: the exam, the questions, pricing, the free trial, and what you actually get.

No - and you should be wary of any site claiming otherwise. Every question here is original, written to mirror the style, difficulty, and judgment the real F1 exam tests. Each one comes with a plain-language explanation of why the right answer is right and the others aren't.

The F1 exam spans 6 domains: Pre-Service Vehicle Inspection (9% of the exam); CNG System Equipment Inspection (15% of the exam); Leak Testing and Repairs (11% of the exam); Emissions and Performance Verification (20% of the exam); System Diagnosis, Maintenance, and Repair (29% of the exam); General Cylinder Safety and Maintenance (16% of the exam). Every practice question on this site is tagged to one of these domains.

The domains are not weighted equally on the exam. By share of the marks: System Diagnosis, Maintenance, and Repair 29%; Emissions and Performance Verification 20%; General Cylinder Safety and Maintenance 16%; CNG System Equipment Inspection 15%; Leak Testing and Repairs 11%; Pre-Service Vehicle Inspection 9%.

The F1 exam has 65 questions and is completed in 1 hours 30 minutes. Our timed practice mirrors that length and pacing, so exam day feels familiar.

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