Exam Preperations


I have a few questions as I am preparing to take the SCP NCM. 

I am in the process of re-reading the admin guide for the 4th time so that I am 100% sure that I do not miss anything, Are there any flash cards available?  I have access to SolarWinds at work so I can practice on a live Network. Any other advice. 

How do I buy the exam, is the exam on line or do I need to visit a test centre, if so it a Prometric or something similar?

Thanks for any input