Step1 : sing up for account using your company email id

   My.nutanix.com

Step:2 click on sign up now

Step:3 once your account got created, login to it and click on Nutanix university

Step:4 click on certification

Step:5 click on NCP

step:6  click on NCP exam

Next select schedule exam

click on exam schedular

It will redirect to PSI site as shown below

Use Voucher code:  NTX90B20   on payment screen