For all those who are enthusiastic to learn the Nutanix Administration course and to be a certified NPP (Nutanix Platform Professional), I strongly recommend to visit their education portal http://nuschool.nutanix.com and enroll yourself. I've completed the course and cleared NPP Certification Exam 4.5 last Monday. Its a decent self paced course which may take around 8-10 hours.
The exam has 50 objective questions and you need a minimum of 80% to pass. If you are not successful at the first attempt, don't worry, you have two more chances. In my first attempt I was able to score 3523/ 5000 only. And on my second attempt I scored 4500/ 5000.
Once you pass the NPP, you can apply for the next level of certification which is NSS (Nutanix Support Specialist) and then to the ultimate level NPX (Nutanix Platform Expert).