I passed my SCJP with 90%. I prepared for about 5-6 weeks, with a busy fulltime job and an hour commute. I used K&B's fanstastic book, took Dan Chisholm's exams and took the Marcus Green mock exam (made about 75%, which was a downer).
Now onto my original goal, SCBCD. I already bought K&B's book (yes, going to the well again) but noticed that the book doesnt come with the electronic book on the cd. The electronic book for the SCJP book was very helpful, I would take printouts of individual parts and read on my way to and back from work instead of having to carry the bulky book around.