OK Passed the Exam. How was it. I cannot tell you what the questions was and frankly I do not quite remember them. But here are my thoughts about the exam.

1. You must go through the training course (which is free online, do all the exercises as there are concepts that are not in the slides or materials. And do the DYI exercises. I personally did them maybe 4 or 5 times. And I took the 3.8 online free course though that might confuse you as there changes between 3.8 and 4.0 like flowVars which is gone completely.
2. I would recommend going quickly over the mule runtime documentation. And just trying to build a practical example.
3. An understanding of Java and Spring either MVC or Boot frameworks would help but not necessary as it will help you understand how flows are translated into Spring code then compiled
4. If you have time on your hands, go to git hub and download the free Sample for MuleSoft from MuleSoft and the open source code. Yes, that is an overkill.
5. Now how about the questions, They are mostly tricky questions, most of the answers are extremely similar. You have to consider them thoroughly and find the best answer. Many are very simply minor colon, or semi-colon difference. Very low level syntax error so yeah if you have special glasses for the computer use them!.
6. If you are taking the course from Home make sure you turn off your cell phone, phone etc. and do not speak to yourself. And yes you will not be able to use your big screen TV, you will be limited to the laptop screen.
7. Hope this helps. I wish I can say it was easy I answered it in almost halftime with reviews, but I was really annoyed by the questions and every question is just trying to trick you.