First of all, sorry for a late reply
@Tanya Shetty: I am not sure what do you mean by Real Exam quizzes but I prepared from K&B SCJP 6 book and took its master exam and Exam lab quizzes.
@Rosalin: If you have studied the certification guide by K&B 6 thoroughly and have understood all the concepts then you are good to go. Moreover, do not forget to take as many mock exams as you can. This will help you to measure your strengths and weaknesses. In addition, this forum is a great resource for Java learners. Make sure that you make the most out of it.
-Kapil