Hello Kamran, 

It is difficult to predict cut off for EWS students but based on previous year trends, you are required to score around 75 marks or 85 percentile. EWS category benefits are not too ahead of general category. There is only a 1-1.5% drop in percentile. It is usually more difficult for EWS than OBC. But it is difficult to predict such a thing as it depends on variable factors that may change every year. 

Hope this helps.