ETOPS,
While the written test is very straightforward, don't forget that you also have a oral portion during the checkride itself, which can be far more detailed and cover any part of the regs or practical aspects of flying.
Since the oral is done on the ground before flying, the Examiner tends to form an opinion of your competance which can colour how stringent they are in the air. So, it's well worth spending time going through the FARs with an instructor beforehand.
FWS