Hi Jeffery
I think
you should concentrate soley on JQPlus and if time permitting attempt some of the Marcus exams (3 in total).
I took the exam 3 weeks ago and failed, but my score was similar to what i was getting on the JQPlus exams, I am doing a resit soon and was quite unlucky with questions(4 fill in ones) i didn't use "" for so that tripped me up.
The exam is not difficult but i agree with most people that pass that you do need a solid understanding of all the principles/objectives.
The code in the exam is about 20 or so lines max on some questions mostly Threads, Overriding/Overloading and
IO and the majority of other questions just require knowledge and understanding of things like access modifiers, variable scope etc.
Hope this helps