This has personally helped me improve a decent amount, hopefully it helps you too:
1:
Reading the study guides multiple times. I've now read Mala Gupta's book once, and K&B twice. I'm also thinking of getting Jeanne Boyarsky's book and going for OCAJP8 - but I'm not sold yet...
Anyway, my point is it is *amazing* at how much quicker I can read the topics, how much more I understand, and how I cringe at some of the logic/notes I made while doing the practice tests the first time round (when I too was convinced I knew the subject areas). I'm *still* caught out by the odd question too, and it bugs the hell out of me!
Personally I'd read the book(s) again, and at the end of every section, or chapter, google 'topic + coderanch' and have a read through here too. I'm much better at a variety of topics because I asked here.
2:
Repetition. I've studied for months too, and although it may sound like a positive I've found it gives you time to forget the intricacies of the language. For example, I know I (probably) can't quickly remember *all* of the attributes of interfaces and their members even though I could 'work it out' - this isn't good enough under exam conditions and I know it, but I've got an obvious page in my note book that I can easily flip to. Having written that I've now stuck it to my wall. There is no way I'm forgetting it now! Coding examples helps too, and people swear by it, but I'd stress that you need to
just keep coming back to the topics repeatedly, coding or otherwise.
3.
Enthuware. Take the test, near the pass mark? Back to the books. Nearer 70? Go through the answers one by one, carefully. This way if you're borderline on the test you *don't* look at the answers and risk memorising them. Enthuware's forum is useful too once you've a better grip on the exam.
4.
Beg Roel to take it for you. I'm not sure how successful this suggestion will be, but I get the feeling payment would be in Belgian beer
Hope that helps - I'm certainly no expert and haven't passed the thing yet, but have a 68% and a 64% on the first two enthuware exams and know deep down that I don't know the topics well enough. I'm pretty sure that'll be the case for you too. It isn't about 'knowing how to pass the test', it's about knowing the content inside and out!
Regards
Nick
1
(except for the 4th point 
)
Although I'm from Belgium, I don't drink beer, I even don't drink any alcoholic beverages 
Maybe that is why I'm good at memorizing those little intricacies of the Java language. So that might a good suggestion as well 
