Below are some pointers:
It is always a good idea to do some practice tests before
attempting the real exam. There are some practice tests available online. You
can find one at: http://www.simplilearn.com/resources/free-practice-tests
Prepare a sheet of keywords. A lot of questions are based on
your understanding of keywords e.g. What is value to customer? What is CSI?
Etc. Memorize as many ITIL Keywords as you can before taking the exam
Answer the questions in the paper from an ITIL perspective.
Remember the questions are based on your understanding of the ITIL concepts and
not on what you may practice in your organization.