The most comprehensive EPA Section 608 Universal Certification exam preparation resource available — fully updated for the 2026 AIM Act and A2L refrigerant transition. 350 practice questions across all four exam sections — Core, Type I, Type II, and Type III — with all four answer choices explained. Built for HVAC technicians who need to pass on the first attempt. INCLUDES: 25-pattern Trap Question Decoder · 28-Day Study Plan · AIM Act 2026 & A2L Updates · Memory Aids and Mnemonics · Quick Reference Cards · Cut-Out Field Card Part of the Caelum Compliance Series. Pair with The Complete Refrigerant Compliance Library (Vol. I–IV) for full regulatory reference and the Refrigerant Service Log Book (Vol. VI) for EPA-compliant field documentation. Caelum Workshop · Aeternum Per Caelum · Chattanooga, Tennessee