I had done the following in preparation for my interview -
1. Info on the Internet - I went over all the material that was posted for the trades of my choice on the following websites -
2. Speaking with people in the trade -
For this I went to some of the local militia units. I told them that I was a Regular Force DEO applicant, however I'd like to know more about their job not just to prepare for the interview but to increase my knowledge base. I spoke with members of my family (who are ex and current officers in a foreign army). One of my trade choices was HCA. For this I went and met the administrator of a civilian hospital.
3. Books -
One of the books I invested in was "The Illustrated Encyclopaedia of Artillery" by Ian V. Hogg. Before the interview, I had read this book twice from cover to cover.
4. Mock interviews -
I did numerous mock interviews with just myself and my wife. This helped me a lot on the actual day.
5. Knowing the trade, organisation and yourself -
This goes for any kind of organisation. The interviewer(s) will have only a few hours of time in which to interview you. Unlike your family or teachers, they only know you through the paper work that is in front of them - Reliability Screening results, forms submitted during application, degrees, CFAT and medical results, etc. The MCCs give you every opportunity to prove to them that you will be an ideal candidate. It is imperative that you know very, very well the trades of your choice, the CF in general and yourself.
6. Reference/ Commendation letters -
For the interview, I had taken along a folder in which I had kept my degrees, reference letters and commendation letters. (I had not been told to do so). For most of the questions that I was asked, I had a official letter to back the example that I was citing. The interviewers were very impressed with this. They made copies of all my commendation letters and placed them in my file.
7. Dress and deportment -
I had worn a suit for my interview. At the very least one must wear dress clothes with proper lace-up shoes and a tie.
Lastly, I am not a recruiter or a member of the CF. I am just an applicant. The above mentioned pointers stood me well, that is why I am sharing them.
All the best,