If you look at the notification in the official website, https://jkbopee.gov.in/Pages/Applicant/Information/Archives.aspx in 2019, until Round 1 EWS Category reservation was considered under Open Merit Category alone. The seats were not included yet. And there was no mention of  EWS reservation for the year 2019. And so to give you EWS data for 2019 might be difficult. But in 2019, under State Quota, 533 marks secured a seat in GMC, Jammu under Open Merit Category. Now this is 2019 data and for 2020 under EWS you will need atleast 500 for a seat in GMC Jammu. This is because cut offs change every year. Cut offs change every year depending on various factors such as no.of Candidates appearing for the exam, no.of Candidates qualified, top NEET score and difficulty of the exam.