I cleared the OCPJP 6 with 95% today.
I spent 1 month studying K&B cover to cover. Tried the mock exams given in K&B. I also went through many questions given in "OCP Java SE 6 Programmer Practice Exams" book.
There were no drag and drop questions or thread related questions. The difficulty level of exam is "Above Average" I would say. I guess I missed out on questions related to stringbuilder and boxing concepts.
I want to say a big "Thank you" for everyone who is hanging around these java forums and helping guys like me.