Sure , I can help you. This is what I've learnt while preparing for the exam.
For me, the hardest part was when to write the exam, was I ready enough, have I learnt all the topics. So I would recommend go for the test once you are truly ready unless there is a deadline you have to meet. I kept changing my intended date, but I finally could score as high as I could. I prepared using K&B Java 5 SCJP Study Guide.
Once you are sure you are ready do as many mock exams as you can. Javaranch FAQ gives you a list of Mock Exam sources. I've tried all the links, some aren't working though. I found Devaka Cooray's ExamLab Simulator very helpful. It's got 5 mock exams and the questions are not easy. Also it's got lesser time than the actual exam. After the mock exams do a thorough review of the questions. I had done a review after every exam so that I knew the Question Model and also how to solve it.
For any doubts regarding the answers, you can search on Javaranch. I've never had to post on Javaranch, I could always find a solution or a similar question by searching.
Also type out the code in an editor, don't copy paste. I've got many many lines of program code on my computer.
BEST OF LUCK !!!
Drag and drop questions turned out to be relatively easy. There were yellow boxes onto which you had to drag and drop green answer boxes. If you try to review those questions, be warned !!! You will have to answer it all over again.
Like I said, I had used ExamLab Simulator. While reviewing Dr&Dp questions in it, we have no way of finding the what went wrong. And I was always wrong on ExamLab !!! So I would redo only the Dr & Dp questions once or twice more.
So for the exam I was always vary of Dr &Dp and I reviewed every such question in the actual exam, since there is plenty of time.
Have fun !!!