Hii,

EWS reservations are given to the Open category whose income is low (income below 8 lakhs ).They are provided 10% reservation for government job exams,entrance exams etc

If you (your caste) fall under OBC central list or state list you cannot get ews certificate as you are already having reservation.

But if you donot follow under these two lists ,you need to satisfy the eligibility criteria of Ews.

Hope it helps

Thank you