In first instance I want to wish you all the best for Monday's exam, I think we all have been there or we will going there very soon, aren't we. Nerve-tracking indeed, but well worth it I believe it.
The best advice I can give is practicing, practicing, ...
If you have passed the exam from Marcus Green with more as 80% then I would be confident. To practice a little more you can also have a quick look on javacertificate.com and then you see which objective you need to study a little more.
http://www.javacertificate.com Good Luck. And let us know your scores!
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