hi,

see you have to mention about the ews criteria during filling the Jee main form, means you have to apply for Jee main exam from EWS category. based on your category  you would be allotted rank and can participate in counselling. if you have applied from  general category, you rank would be based on performance of general category students. so after declaration of  results your ews certificate would not help if you have to mentioned about ews criteria during the form filling.

hope you may understand.