I am practically doubt-free in two months

I am a doubtful girl. I am always entangled in ifs and buts. And with the preparation of the ICBB certification exam, the doubts had increased to an extent. However mock tests attempts of the IASSC Certified Lean Six Sigma Black Belt practice questions helped me resolve my doubts at a quicker pace and i could clear all the doubts related to Statistical Process Control (SPC) and Fractional Factorial Experiments topics eventually.