Coming to what questions are asked during the interview. Always do good research beforehand on the country you are visiting. Research about its language, culture, important historical places, etc. As it's said that the first impression is the last impression. So always groom yourself up and feel confident while speaking. Take some extra time to relax before you head for your interview process. Speak confidently with eye contact and hand gestures as it's a sign of positive and confident body language.
Once you are done with the interview, go through all the information on the visa stamp carefully. It's significant to make sure there are no typographical errors in your name, number, etc. And if you find out any error, you should contact the center and get it rectified. Always remember that even a small error would not be tolerated.
With these points to remember you can keep yourself out of trouble and confusion. After arrival always follow the rules and regulations of the country and have safe business travel.