Hello Rahul,
We explain this on our PrepCast Elite page at
www.project-management-prepcast.com/pmp-exam/the-pm-prepcast
, but you may have missed it. Here's the statement:
No Time Wasted: Study Now and Practice Later. If you are like most then you probably want to first go through the training but wait with your simulated exams until later. No problem! The 90-day simulator access countdown only starts when you take your first exam. You won't lose or waste a single day until you are ready.
So no worries! The simulator "waits" for you until you are ready.
Oh... and THANK YOU for being a customer. I really do appreciate it!