Hi, I have not given the exam yet but i am planning to appear soon. As my already qualified friends suggested me, the minimal book is the Certification book not sure about the author names, but i think Bert Bates is one of them.And mock exams are a must as suggested by my friends. I think you will get more helpful replies soon..
Manak, As per my experience,Certification book by kathy & Bert is the best book and sufficient for the exam preparation.Along with the book ,javaranch SCJP Forum and other mock exams will be of great help.
If you have time also refer khalid mogul book. Thats good enough.