So I just got my results last week and I finally passed the CIH exam on my second try. First attempt I scored a 499 — one point short. Brutal. I cried a little, not gonna lie. The second time around I completely overhauled my study approach and hit a 541, which honestly surprised me.
The biggest change was ditching the textbook-only grind and actually doing timed practice under real exam conditions. I found a solid CIH practice test resource that mirrored the ABIH blueprint pretty closely — especially for the math-heavy sections like noise dosimetry and ventilation. I also leaned hard on a structured study guide that organized topics by domain instead of just chapter by chapter, which helped me see where my weak spots actually were.
My main exam tips for anyone prepping: don't underestimate the engineering controls section, and make sure you can do the OSHA PEL/TLV calculations cold. I spent probably 180 hours total between both attempts. Happy to answer questions if anyone's in the same boat I was.