Hi Amarendra , welcome to javaranch
one of the best books for SCJP is the one by Kathy & Bert ,that book covers everything you need to know about the exam... you can find it
here and for any doubts you will always find someone at javaranch willing to help
The significant problems we face cannot be solved by the same level of thinking which created them – Einstein
SCJP 1.5, SCWCD, SCBCD in the making