Passing a certification test in any of the HVAC areas requires three things:
These three are important for any certification test—such as NATE, ICE, RSES, and HVAC Excellence.
We can't help you gain experience, but we can show you how to increase your technical knowledge and your skill in test taking.
To give you technical knowledge, I put together the following list of books that can help you in six areas that are tested for certification exams.
For skill in test-taking you need the book HVAC Technician Certification Exam Guide by Norm Christopherson. If you already have experience and technical knowledge, this is the best possible preparation you can have for passing a certification test. This book provides:
LAMA Books, 510-785-1091, 888-452-6244