My organization (public works for a large County) is as Allen describes, the questions are always from a list, and are not Civil 3D specific. So be prepared for the typical interview questions that cover many positions:
* Give an example of a challenging situation, and how you solved it
* Give an example of how you organize your work and manage deadlines
...and so on.
If you can tailor your answers to Civil 3D you'll do well. So, for example, "Well one challenging deadline required me to revise the FG profile, and edit my corridor by doing x, y, and z..." filling in the details, of course.
If you aren't that experienced with C3D, don't bluff your way through, obviously.
And if you are interviewing at a private firm, then expect a CAD manager or an engineer to grill you in far more detail to suss out how much you really know about C3D. You really can't bluff your way through these questions.
Without knowing a few more details of where you are interviewing and what the position is, we can't give you better answers than this.
Perhaps, if your skills are still developing, the first question to ask them at the start of the interview is just how much they expect you to know, and how much mentoring / on-the-job-training they expect to provide you. Everyone knows that CAD techs and new engineers don't have a deep depth of experience and so employers expect to do some training of new hires. Your question is how much they expect you to know versus how much they will train you.
If I'm interviewing an applicant for a Tech-III position, I expect that person to be a recent graduate of a technical program, or a person with a few years of work history driving AutoCAD and/or C3D. I don't expect them to be a power user. We can teach them the rest on the job.
If I'm interviewing an applicant for an Engineer-II, I expect that person to show me they have done some complex corridor modeling, are very comfortable doing take-off's, and can generate bid-ready plans, among other things. They should be very familiar with most of the parts of C3D, and maybe even be able to teach me some new things. I should only need to give them our standards guide, and they can jump in and be productive with little to no mentoring.
Jeffrey Rivers
Win 10 Pro 64-bit, Intel i9 3.7GHz, 64 GB
NVIDIA RTX A4000
C3D 2020 V13.2.89.0