Dear Savita

According to 2018, the last rank at which the seat has been allocated was AIR 2212 and Category rank 540 for OBC at AIIMS Mangalagiri. I am sorry to say that there are nil chances for you to get a seat as only 324 seats are reserved for OBC but there can be little hope as 6 new AIIMS have been introduced this year. 

For more information, you may visit https://medicine.careers360.com/articles/aiims-mbbs-cut-off or can comment for more queries.

Note: Merit list changes every year and only on that basis the admission is done.

Hope this helps you