The QB is a great tool, if used correctly. There's absolutely no harm in using it, provided you're not learning it pro rata. BGS even warn students not to do so, examiners know some people do it and its not hard for them to change a few numbers/words to give a different answer and leave the QB answer in the list to catch these people out.
Use the QB to gain exposure to the style of questioning you can expect and identify where you're going wrong, definitely don't just simply learn all the Q & A.
In answer to the OP, apparently there are new questions creeping into the exams from time to time.