Thanks to all the ranchers for helping get through!
Adding : my preparation
I went through the Kathy and Bert book two times. In the first round I did all the assigments and practice questions as they came in the book. (second round was quick one)
I went though the mock exams:
Lastly (1 day before the exam) I took the master exam in the CD and my score was 51 and postponing the exam crossed my mind (However I did not postpone)
I recommend that as and when you finish the chaperts from K&B, take the section wise tests, that will ensure your understanding of the topics and if you aren't 100% sure about some topic, try to implement it and that should clear your doubts. (and java ranch and ranchers are always there to help.. )