First of all , all the NEET  counselling is done on this given site i.e. mcc.nic.in 

The process is began with the registration  in 1st round  . Once all the step has been done then the seat  will  be  allotted.        If you have not allotted  with any seat in 1st round then you can go for the 2nd round of counseling  then on mop up round respectively ( with new registration again ) 

So for every round you need to do registration with all the following  steps again .

You can proceed  your counseling  process  as per your own  capability  by interest  its depend upon that you are eligible  for NEET pg or not .  

Thankyou !