First let us look at the previous year cut off for admission into a government medical college in Jammu and Kashmir.

Open (General/Unreserved Category) -
NEET Marks - 440
NEET Rank - 50,280
College - Sher-e-Kashmir Institute of Medical Sciences, Soura, Srinagar

SC -
NEET Marks - 361
NEET Rank - 1,10,791
College - Sher-e-Kashmir Institute of Medical Sciences, Soura, Srinagar

ST -
NEET Marks - 266
NEET Rank - 2,31,073
College - Government Medical College, Srinagar

Keeping in mind cut off varies from year to year, I would suggest to target for a score of 470+ (if you are general category)/380+(if you belong to SC Category)/280+ (if you belong to ST Category) for a sure shot selection.