Hello,

All these short forms denote the cutoffs of the various categories(caste) and various quota the student belong in.

1)GM -General Merit

2)GMK -General Merit Kannada

3)GMR -General Merit Rural

4)2AR -2A Rural

5)2A - 2A general

6)2AK -2A Kannada

7)2BG -2B General

8)2BK -2B Kannada

9)2BR -2B Rural

10)3AG -3A General

11)3AK -3A Kannada

12)3AR -3A Rural

13)3BG -3B General

14)3BK -3B Kannada

15)3BR -3B Rural

16)1G - 1 General

17)1K -1 Kannada

18)1R -1 Rural

19)SCG -Schedule Caste General

20)SCR -Schedule Caste Rural

21) SCK -Schedule Caste Karnataka

22)STR -Schedule Tribe Rural

For knowing the details you can copy paste and seach from this official link-

http://kea.kar.nic.in/KEA%20Brochure_Inside%20Pages%2020_37%20Color.pdf

All the Best!