Some find Enthuware's mock sets to be their best predictor of success or failure, enough to decide to either take or postpone the exam based on their numbers.
However, if you are doing this poorly on the Sybex questions, don't despair, don't give up, but certainly don't schedule the exam yet either!!
Their questions are not much harder, in general, than the real exam questions, tho in general the real exam questions tell you how many answers are correct to choose for each question and the Sybex questions do not.
Both their questions and the real exams expect you to know the material very, very well.
If you kind of sort, pretty much, more or less know it, there is almost no hope of passing at that time.
Don't get discouraged, keep studying, and because of the phenomenon that if you see the same questions too many times you memorize the answers and think you are okay for the test when you are not -- you are going to want some source of more mock exam questions when you do start getting much closer -- Enthuware and the Sybex book of mock exams are two popular sources, there are a number of others as well.
Other people would say "Have you figured out why you are getting so many wrong? Did you not realize the level of detail they expect you to commit to memory? Are you not practicing writing programs using the new features you haven't used before? Are you having trouble reading the questions and determining exactly what they want from you?"
Those were the very long answers, the short answer is "The Sybex Book mock questions are NOT very much harder than the real questions, except that they don't tell you how many answers to choose as correct for each question." Additionally, because questions on the test (and to be fair sometimes in their mocks) appear to be asking about one topic but the answer really hinges on another, there can be even more of that seen on the real exams.
RTFJD (the JavaDocs are your friends!) If you haven't read them in a long time, then RRTFJD (they might have changed!)
I did not take the exam yet so please take my advice with a grain of salt.
I also had a hard time with the questions in the sybex/boyarsky book.
Currently I'm preparing using enthuware mock exams and I must say that I have a much better feeling now and I find the enthuware exams much more precise.
The questions/answers in the boyarsky book are sometimes very ambigous and require you to guess what the authors might have meant and what exactly they are asking. Super frustrating.
That also happens with the enthuware exams but much less often.
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