Hello Ayantika, AIIMS never releases closing cutoff marks. They always release closing ranks. For example 2018 closing rank for AIIMS Mbbs course were as follows:

General Candidates 

AIIMS DELHI- AIR 53
AIIMS JODHPUR- AIR 459
AIIMS BHOPAL- AIR 647
AIIMS BHUBANESWAR- AIR 542
AIIMS RISHIKESH- AIR 769
AIIMS PATNA- AIR 1222
AIIMS RAIPUR- AIR 1145
AIIMS NAGPUR- AIR 1324
AIIMS GUNTUR- AIR 1353

OBC Candidates 

AIIMS DELHI- AIR 236
AIIMS JODHPUR- AIR 958
AIIMS BHOPAL- AIR 1516
AIIMS BHUBANESWAR- AIR 1453
AIIMS RISHIKESH- AIR 1664
AIIMS PATNA- AIR 2048
AIIMS RAIPUR- AIR 2074
AIIMS NAGPUR- AIR 2168
AIIMS GUNTUR- AIR 2212

SC Candidates 

AIIMS DELHI- AIR 1081
AIIMS JODHPUR- AIR 5704
AIIMS BHOPAL- AIR 8657
AIIMS BHUBANESWAR- AIR 9038
AIIMS RISHIKESH- AIR 10471
AIIMS PATNA- AIR 14195
AIIMS RAIPUR- AIR 13607
AIIMS NAGPUR- AIR 13638
AIIMS GUNTUR- AIR 14510

ST Candidates 

AIIMS DELHI- AIR 2090
AIIMS JODHPUR- AIR 17468
AIIMS BHOPAL- AIR 22120
AIIMS BHUBANESWAR- AIR 19414
AIIMS RISHIKESH- AIR 23966
AIIMS PATNA- AIR 24045
AIIMS RAIPUR- AIR 23579
AIIMS NAGPUR- AIR 23875
AIIMS GUNTUR- AIR 23232