Sorry for the delayed posting. Now, I am back in KSA.
Thanks to Allah, I also passed the interview. As mentioned by some other mates, the VO's main focus is to confirms matching of your listed duties and day-to-day routines. He will ask you give examples on your duties and to walk through the process of your work. The interview took me about 30 min. The VO also checked the Forms, Education certificates, Reference Letters, etc.
If you are genuine, you will pass. But, overall it is very stressful for me as it is your life-turning milestone.