@Shalini OCPJP is really not about going through the book but understanding the concepts. You need to perfect all the concepts and then give the mocks. The two mocks i prefer is K&B's mock and Devaka's Examlab. With say a minimum effort of 21 days including solving the mocks, you would be prepared for the OCPJP.
[ SCJP 6.0 - 90% ] , JSP, Servlets and Learning EJB.
Try out the programs using a TextEditor. Textpad - Java 6 api