sonir,
(regarding your PM): if you have good knowledge of
java, OO, you will pass (even though not so good with io/threads). the questions are not as difficult as jq, so don't rank yourself based on that. marcus green's mock exams are closer. once you have done with the RHE book, do several readings of Vel's notes. that will help you with theoretical questions. for io it will be helpful to know the constructors of various available classes - focus on which ones append, work with encoding, autoflushing, can work with binary data etc.