COHN exam prep — how long did everyone study and what resources actually helped?
I've got about 12 years in occupational health nursing and I'm finally sitting for the COHN. My employer is pushing for it and honestly I should've done it years ago. I've been told the exam covers a wider range of regulatory content than most people expect coming from clinical backgrounds.
Currently 9 weeks into studying, about 2 hours a day on weekdays. I'm feeling solid on OSHA standards and workers' comp case management but the occupational epidemiology and toxicology sections are giving me trouble. Practice test scores are running around 74–76%, which isn't where I want to be.
Anyone who's passed recently — did you find the actual exam harder or easier than the ABOHN practice questions? I keep hearing the exam leans heavily on judgment calls in ambiguous case scenarios rather than straight recall, and that's a different kind of preparation.
Fourteen years in the field and the regulatory section still got me on my first attempt. Passed the second time after spending 3 focused weeks just on OSHA 1910 standards and DOT requirements. Don't underestimate how detailed those questions get.
The case scenario questions are real and they're tricky. You'll see situations where two answers both seem clinically reasonable but one aligns with occupational health ethics and scope of practice specifically. That nuance is worth studying for deliberately.
I passed mine 8 months ago with a 79%. The toxicology section was genuinely harder than the practice materials suggested — a lot of questions about specific exposure limits and biological monitoring that I had to look up afterward to verify I'd answered correctly.