Dear Manoj

With category rank 13403, it might be little difficult to get a seat in AIIMS. As the last year 2018 cut off AIR was 14510 and category rank was 304 for SC and the college allocated was AIIMS Mangalagiri with same rank.But, still there might be some chance for you as 6 new AIIMS have been introduced this year.

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

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

Hope this helps you