Hi, since you have not specified what specialization you want to do for your Post Graduate Degree it is very difficult for me to let you know which college you can choose in order to get optimum results. So, for your preference list you can add all the best colleges as your preference and as you go lower keep some colleges that you know and are sure of getting into it. Below is the link to all the colleges that are affiliated to PGI Rohtak.

https://medicine.careers360.com/colleges/list-of-government-medical-colleges-in-rohtak

If you still have doubts feel free to comment. Hope this helps.