HVAC Exam Master is a web-based study platform for HVAC/R students, apprentices, and technicians preparing for EPA 608 and NATE certification exams. It combines practice questions, answer explanations, and mock tests to help learners check their understanding and identify topics that need more review. Mistake review, bookmarks, and progress tracking make it easier to revisit difficult questions and organize study sessions around weaker areas. EPA 608 preparation covers Core and Types I, II, and III. NATE preparation includes Core and specialty topics such as air conditioning, heat pumps, and gas heating. The platform runs in a web browser, with free practice available and optional one-time purchases for expanded lifetime access. It provides exam preparation resources; it does not administer certification exams or issue credentials.