Hello Abid,
I did SCJP6 this December. I've used ExamLab for practice... and struggled a lot with it...
Questions in it are really very tough as compared to the actual exam... (at least till that date the situation was like that...

)
The ExamLab itself says that if you score 60% in it then you can easily look for 90% in the real exam... so don't be discouraged on getting low scores in it.
as for scjptest.com... i just came to know about it from you...

thanks... :)
I just checked it .... It's using the old
pattern of the exam (I think so...

) with 72 question....
In SCJP 6.0 there are 60 questions only with 58.33% passing marks and a duration of 180 minutes...
all the best for your preparations.... :)