I think that if you failed the CK twice then maybe you should consider a course- sometimes these courses offer a lot of insight. Also I think that doing questions and really reading the explanations is mandatory. When I did CK I really felt as if the books gave me cold facts but the test really wanted integration and some knowledge of guidelines. I think that the best way to do it is either with a course or a good study buddy. All in all it jst one more thing you have to push yourself through to get it over with.... Good luck