I (barely) passed my NRPP exam today with knowledge exclusively based on InterNACHI’s Advanced Radon Measurement Service Provider Course. The exam was way harder than expected. I may not have put enough time into it if not for the warnings above, so heed their advice. I squeaked by with 73% but got it done first try. If it was not so expensive, I’d study again and re-take to feel better about my score. 2/4 on ethics! Wow.
Many questions seemed to have multiple right answers. Example, which device is more susceptible to air movement: AT, LS, EL, GS, … - I thought they were all affected by moving air like in ventilation, no? The questions are also thoughtful. 100 questions, 2 hours which was plenty. The less you know the more time you’ll have Formulas and calculator are provided. Very little math. Know how to figure which is more exposure: 52 years in 4 pCi/L at 0.4 ER versus 7 years at 30 pCi/L at 0.6 ER, etc.
I agree with all comments above that the NACHI course is not an ideal basis for NRPP exam, however its all in there including the long boring parts.
(1) Download the Advanced Radon study guide - there is a link to it near the top of the course. It is easier to re-read in PDF format than to step through the course page-by-page again.
(2) Many questions are based on the EPA Radon guides. Those are in the NACHI course, or get them at https://www.epa.gov/radon/publications-about-radon.
(3) There were more questions about mitigation than I expected. I skimped on those since that’s not what I’ll be doing. Mistake.
(4) Know all the device types, not just the one you use/plan to use.
Point is, you really have to cover all elements of the course.