Just had the interview last month, not as easy as you may think. Out of 8 of us, there was only 4 that made it to the second round. Not sure how many from there made it. All the guys I met were very experienced for the position.
The tech test was not that easy for myself and I even studied but of course they do not let you know what your mark was. There did not seem to be much weight to the test, there was one guy that had to do another small test since he did not pass. He still went onto the second round.
This guide I bought was very valuable for myself in getting through the interview,
www.emiratesinterview.com
I also recommend getting the book called "Ace the technical pilot interview" You could search this on Google. I bought it from amazon books.
Hope this helps and good luck!