Just completed NPP 5.0 certification yesterday.
I have to say it is tougher than 4.5.
Ensure to go through the training content - ECP Administration 5.0 @NU.school.
Also since the exam expects you to have in depth knowledge of the concepts, ensure to refer to the Support Portal, simple keyword searches will yeild good detailed documents. Some good videos are on youtube as well for certain topics... AFS, ABS etc.
Passed two days ago.
I've to say it's a bit more focused on cli than the 4.5 (ncli, acli)
Prism Central of course and licensing rules.
Some questions are based on real life setup and maintenance so, hand on lab if you can.