Appear in any way you like. You will not be judged on your appearance, but on your knowledge.
Cost: $250 per try, converted to your local currency at the moment you pay for the exam.
You can go here : QlikView 11 for Developers - QlikView Book
But i find also this interesting link : QQotD (Qlik Quiz) - QlikView Blog, QlikView Videos and Tips at QlikShare
Hope it helps