Regarding to the question of why u wanna join EK?
You will need to do some research on the company, and to show why u think EK has been successful, and how great it is to be able to work for them. It shows the interviewer u are interested and know about the company, thus u may like to tell them how ur skills and experience can contribute to the success of the company.
Get prepared, smile a lot..and show positive Body language all the time..also make sure u ask question about the company/policy if there is a Q&A session.
we are having as many as 100 new ppl coming each week, in order to get ready for the A380s and other new Aircrafts..so it is indeed the best cahnce to get in. good luck!