Hello Aspirant, You have mention your Category as Economically Weaker Section(EWS) at the time of form filling, then only you will be alloted seat in the EWS category, and after that you have to show your EWS certificate at the time of Counselling at the reporting centre.You can't directly show your certificate at the reporting centre and ask to give seat in EWS category.so,you can't get benefits of EWS by directly providing at the reporting centre.you will get benefits of EWS certificate only if you have mentioned it in your application form then only you will be asked to show your certificate.