Didnt spend too much time on preparation, just took the practical tests of J@Whiz1.4,It actually covers all tricky part of SCJP which I think all candidates should pay a attention on them. If you can passed those 8 mock tests with 65%-70% average,it should be no problem for you to pass SCJP at all. And again, practical coding experience is much more important.
Thanks for the contribution from anyone in JavaRanch!!