Forget VCA-NV and focus on the VCA6-NV resources and exam: VCA6-NV Certification
Review the exam topics, and take the Fundamentals training.
If you want some hands-on, have a look here: VMware NSX Hands-on Labs | United States
That should be sufficient preparation for the exam.
-------------------------------------------------------------------------------------------------------------------------------------------------------------
Although I am a VMware employee I contribute to VMware Communities voluntarily (ie. not in any official capacity)
VMware Training & Certification blog
