The 10% reservation is applicable for the open category candidates who are economically weak. The ews quota has not been applied in the every satate of india as it has been applied in the few states of the india. So if you belong to the ews quota then you have to produce the ews certificate and you have to apply through the same quota if it has been applied in your state and you will get the benefit in terms of lower range of the cutoff marks and merit rank.