All of this is good advice, IMO. I pretty much did the same. It does help to have experience with the platform. Even for those who may just be starting in ServiceNow or wanting to get in to it, you can use a free PDI. Udemy was helpfully for me. I enrolled in a practice exam Udemy course. It was much harder then the actual exam. Came to find out the author did that by design to help one understand the why and not just the how. It really helped on the exam. Understanding terms, correct names of tables, and such also helped. Like most IT exams they try to trip you up from time to time with wording. In the end it only took my 25 minutes to complete the exam and passed first try. Also carefully read the questions (trust me... there were times I answered and was like oh wait, after re-reading the question). I think you get 90 minutes and ability to mark an answer for review before submitting.