It is my opinion that the CERM is way too excessive in solving every problem in US and SI units. It will be rare that the exam will ask you a question in US and SI, but it can ask you a question in US or SI. But, it is my experience that the exam will test you using common industry standard units for that particular type of problem. Therefore, your soils questions will likely (but not guaranteed) be in cm3 and your water questions in cfs and your transpo questions in mph, etc. You can look at the NCEES Sample Q&Ss to see this. Good luck.
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