I took CeMap, CeRGI and CeSRE, and found the best way for me to get through them was just to get the additional test papers (I think they're about £15.00 each), make copies of them and go over and over and over them, until you are getting 95% to 100% every time you try them.
Some of the modules have 25 questions, and if you are confident that you know the answer to 100 questions on the subject it must be sort of difficult for examination boards to come up with enough totally new questions to throw you
