Hi Reshmi,

These are the various category codes and their full forms:

EZ Ezhava

MU Muslim

BH Other Backward Hindu

BX Other Backward X'ian

KU Kudumbi

SC Scheduled Castes

ST Scheduled Tribes

LA Latin Catholic and Anglo Indian

DV Dheevara and related communities

VK Viswakarma and releated communities

KN Kusavan related communities

OE Other Eligible Communities

EO Other Eligible Communities (with higher income)

EC Communities Eligible For Educational Concessions as in OEC

XS Son / Daughter of Ex-Serviceman

DK Son / Daughter of Defence Killed

HR Son / Daughter of Defence died / in-Harness

SD Son / Daughter of Serving Defence Personnel

RP Son / Daughter of official serving in CRPF / BSF / ITBP / CISF etc

VA VHSE(Agri) holders

DA Degree holder in Ayurveda DH Degree / Diploma Holder in Homoeopathy

NQ Nurse (Allopathy) under State Govt. service for MBBS course

NH Nurse (Homoeo) under State Govt. service for BHMS course

NY Nurse (Ayurveda) under State Govt. service for BAMS course

CF Son / daughter / brother / sister of a fisherman

SG Scouts & Guides

VA VHSE(Agri) holders

DG Diploma Holders in Agricultural  Science

LG Farm labourer or son / daughter of a farm labourer of KAU

LV Farm labourer or son / daughter of a farm labourer of KVASU

LF Farm labourer or son / daughter of a farm labourer of KUFOS

XS Son / Daughter of Ex-Serviceman

CF Son / daughter / brother / sister of a fisherman

DG Diploma Holders in Agricultural  Science

PI Sports Quota Individual

PT Sports Quota Team

LV Farm labourer or son / daughter of a farm labourer of KVASU

CC NCC Quota 

Hope it helps