Hello,
I've been following this forum before my interview last year december, and it helps alot.
My word for you guys is to be confidence whenever you're going for your interview and make sure you give them the the same details sent to KCC. With these there should be no problem. Five DV winners were denied in my presence that day due to wrong informations. So, I'm endeavour you guys to scrutinise your documents very well before going and make sure you give them the details sent to KCC. Also, be sured your place of birth, Date of birth are the same.
Lastly, try to know about your Job, best O level subject before going for the interview, the definition and most important things. During my interview, because I have distinction in Mathematics the consulate officer gave me a question to solve for x as in "x2 + 9x + 6 = 0". Actually she gave me a pen but suprisingly I gave her the answer off hand immediately, she was very happy. I spent less than 3 minute before she gave my pick up slip. If any one of you miss the first question you don't need to be panic, they will give you another question. If you prepare yourself a head you woudn't have any problem.
These are my advice to you all.