I would like to share my experience to get the certification.
At the first try, my score was 68! Only 2 more points to pass, so I verified the workflow and the reasons of the failure. The explanation of the score was not comprehensible.
Reading topics in this forum helped me a little bit, but, in the end, I found the solution using the best practice explained in Robotic Enterprise Framework document, downloadable at the Level 3 Training Course.
It is very useful to follow exercises at that course, but, in my opinion, related walkthroughs do not use every step of the best practice.