I passed it with 67%. The preparation I did was to study really hard on K&B book, the one and only for 4 days. I didn't have time to do any mock up exams only the questions at the back of each chapter. I personlly believe that if you read K&B book and understand them all (I estimate that, with 12 hrs/day it would take me a week and a half to do that), You could pass this exam with 95% up. This is the only one reference you ever needed.