Hey Pir.
The top 20 percentile for Jammu and Kashmir board is not out yet. In the previous year, 2018 the top 20 percentile in J&K board for each category was as given below. You can expect a similar range of cut off to presume as of now. For 2019 it will be released soon.
GEN 401
OBC NCL- 408
SC-309
Best of luck
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