ALI,
You only need to mark the course as a "repeat" if you have previously received a grade for that same course. To clarify, a repeat is for a course that you have previously failed, or received any letter grade in. If the "W" is not included in your GPA, then you did not receive a grade, and do not need to mark it as a repeat. In your situation, you would not need to mark the class as "repeated".
-G