K&B Book has good drag and drop questions. WhizLabs simulator also has a good questions. You can download a free Whizlabs Exam Simulator here and get either over 15 questions with complete answers and reports or the full exam (over 72 questions) with no answers. Some drag and drop questions are there.
Marcus Green mock examsalso have good drag and drop questions very close to the real exam. You can get 60 questions where some drag and drop are included.
I've heard in this forum that sometimes a drag 'n' drop question in the real exam might have more than one solution, however, you are not expected to choose the best one from the JVM point of view. You are just supposed to choose a right one.
So, pay very close attention on drag 'n' drop questions.
"If someone asks you to do something you don't know how to, don't tell I don't know, tell I can learn instead." - Myself
Barry Gaunt also has highlighted a very important issue.
Some people have reported that when reviewing their answers for drag 'n' drop questions, they realized that the question had been reseted.
So, it's recommended that after go away from a drag 'n' drop question you put your answer in a piece of paper just to avoid the situation where you have to re-evaluate entire question and waste your time if it's reseted.
I am also planning to write the exam in the end of March. Maybe between 25th and 30rd.
I've been studying for SCJP since Jan 18th. I am using only K&B Study Guide for SCJP5 which is a very good book. It's enough.
I'm almost finishing to read entire book. Maybe this weekend.
After finish read the book, I will concentrate my efforts to practice as much as questions I can. I've heard that those guys who got more than 90% have writed and praticed a lot of code and questions.
If you are able to spend some money, I highly recommend you to buy WhizLabs exam simulator (it costs US$ 59.95). It has over 582 questions composed by 6 full exams with complete reports plus 150 Quiz questions. Very good stuff.
Furthermore, Whizlabs is comprissed to refund you all amount you spent if you don't pass the exam.
Also there are a few free mock exams available on the net. You can see all links to them in Java Ranch's FAQ.
I also recommend you to spend at least 15 minutes a day taking a look at posts in this forum. Here there are many guys who post tougher questions and tips. I personally have learnt a lot after join Java Ranch.