I personally think you'll be OK in the real
SCJP exam with that score on Devaka's
test, but obviously it's your call my friend!
You may want to take Sun's free proficiency assessment for you suitability to take the exam. It's only available for SCJP 5, but that should be good enough. The questions are to the level of the exam.
http://uk.sun.com/training/certification/assessment/index.jsp