Thank you, Youssef. You provided the most important links about Qlik Certification.
Rana - There is no substitute for hands on experience with QlikView in order to pass the certification exams. These are expert level exams. Visit the web page for all the details, including practice questions and instructions on how to prepare for the exam. We also list the topics used to write the exam questions (Exam Domain Areas).
Certification Program Manager @ Qlik
P.S. Discussing specifics about the exam questions is a violation of the Qlik Certification Examination Access and Use Agreement.