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. They also depend on your Category and the no.of seats available for that Category. RBA and EWS equally have 10% reservation. But it is the no.of Candidates who appear for NEET from these Categories that will make the difference. For example, in UPSC 2020, EWS had lesser cut offs than OBC. So it totally depends on the no.of Candidates that appear from RBA and EWS Category. But on a general note, you will need atleast 550 for a seat in either of the Categories.