Dear Nitin,

An entire in-depth course is included in your subscription for Procure to Pay:

http://portal.oracleerpguide.com/courses/procure-to-pay/

This does not provide a list of questions in a text format, however it provides the conceptual clarity and scenario oriented flows which will be extremely useful for preparation of the interview questions

Additionally, all the journal entries for P2P are provided in this course video:

http://portal.oracleerpguide.com/courses/journal-entries-for-gl-ap-ar-fa-ce/lessons/je03-journals-for-p2p/

These 2 resources together will be very useful for your interview.