The first thing I did when I was preparing for the certification exam was to perform the Enterprise Cloud Administration (ECA) Online 5.10 training available on the Nutanix University portal, this course is recommended for certification.
With a bit of SSD storage, a bit of RAM and VMware Workstation you can build some pretty kick-ass lab environments.
Next Nutanix certifications:
Update NCP 5.10 to NCP 5.15.
Good luck and put in your study time