ASQ Certified Six Sigma Yellow Belt certification exam attempt i made in winter last year but failed miserably. Firstly, i was overconfident. And secondly, i chose PDF sample questions to prepare. However, i did not lose hope and opted for the mock tests this time. These mock questions have prepared me for the certification exam and also for the life thereafter. I learn and grow and make mistakes on the practice tests rather than the actual exam. This is the best way to prepare for a career wholesomely.