My scores on Whizlabs tests were around 86% - 92% (even with some funky scoring style on whizlabs See my post).
Here are some numbers.
1. Completed Whizlabs exams in about 75 - 85 minutes and actual exam in 130 minutes . It has nothing to do with exam tension/nervous etc. I was cool and pretty much tuned myself to take exams. Couple of months back I did my SCJP with 83% 2. Sentence phrasing (questions) were much easier and straight forward to understand on Whizlabs and it was not the case on actual exam 3. Whizlabs tests have about 6 drag and drop questions. Actual exam had 13 drag and drop questions 4. Following sections are easier on Whizlabs
Building Tag Libraries
Web Container Model
Whizlabs SCJP simulator seems to be better. SCWCD simulator needs lot of proof reading and verification of some code presented in the exams.