I cleared the SJCP 1.4 today. Nowhere near the 90 percentiles but I am pretty happy that I reached this point.
I loved the K & B book, their witty writing made reading the book a pleasure.
I also tried Dan's individual topic exams and also Marcus's 1.4 mock exam, also the free set of questios from javacertificate.com.
What I really think helped me were the questions at the end of each chapter in the K & B book and made sure I understood the reasoning behind each question and last a big thanks to all the people that post their questions on javaranch and all those members who take time to answer them.