Original research

NCSO Module Difficulty Index

Original research by the NCSO Prep team, Alberta · Last reviewed 15 August 2026 · Sources

Help fellow NCSO candidates by rating which modules you found hardest. Real data from real candidates - no fake reviews.

Rate your experience

Which module was hardest for you? Select a module Health and Safety Program Development Principles of Health and Safety Management Auditing COR Audit Legislation Hazard Identification and Control Incident Investigation OHS Statistics and Risk Management Health and Safety Culture Professional Practice What was your mock exam score?

68%

What industry do you work in? Select an industry Pipeline/Oilfield Commercial Construction Industrial Residential Other Where are you located? Select a location Calgary Edmonton Fort McMurray Grande Prairie Red Deer Lethbridge Other Alberta Outside Alberta How long did you study? Select study time Under 1 week 1-2 weeks 2-4 weeks 1+ months Submit my rating →

How to use this index

If you are still studying, spend extra time on the modules that candidates rate hardest. COR Audit and Legislation consistently come up at the top, and they also carry a lot of weight in the exam blueprint. Use the free timed mock exam to test yourself across all 10 modules, then come back and rate your own experience once you have a score.

If you have already written the exam, your single submission helps the next candidate plan their study time more realistically. It takes about 20 seconds and is completely anonymous.

Questions people ask

Which NCSO module is the hardest?

Based on candidate submissions so far, COR Audit and Legislation are most often rated the hardest NCSO modules, followed by Auditing and Principles of Health and Safety Management. Difficulty varies by your background and industry.

How many modules are on the NCSO exam?

The NCSO exam covers 10 modules: Health and Safety Program Development, Principles of Health and Safety Management, Auditing, COR Audit, Legislation, Hazard Identification and Control, Incident Investigation, OHS Statistics and Risk Management, Health and Safety Culture, and Professional Practice.

Is the NCSO exam harder than the CSO exam?

There is no separate CSO exam because CSO is a job title, not a designation. The NCSO exam has a 75% pass mark and covers all 10 modules in a single 2-hour sitting, which most candidates find challenging enough to require several weeks of focused study.

What is a good mock exam score before the real NCSO exam?

Most successful candidates score at least 75% on mock exams before booking the real thing, since 75% is the actual pass mark. Based on submissions so far, the average mock score sits around 68%, which means many people benefit from more practice before exam day.

How is the NCSO Module Difficulty Index data collected?

Data is collected through the anonymous poll on this page. Submissions are stored locally in your browser and aggregated with seed estimates based on the ACSA exam blueprint. No personal information is collected and no submissions are fake.

Last updated 15 August 2026.