Finally, after months of studying and preparation, I finally got the courage to try out the exam today and surprisingly, I got 91% (I expect around 70%). I was quite well-prepared but I always felt I need to study more.
K & B book is the best aids, no question about it.
I also purchased the Whizlabs which helped me get familiar to the exam format (especially with drag and drop questions).
But the LearnKey exams type of questions are similar to the real exam too.
I think that's it and I am ready to go for the next level.