Kartik, EBC and EWS categories have 2 different outreaches. EBC is a sub division of OBC Category and EWS is a sub division of General Category. So you cannot belong to EBC and EWS because you cannot belong to OBC and General Category at the same time. So you cannot choose EWS Category if you belong to EBC Category. EWS is a reservation for Candidates belonging to General Category whose annual income from all sources is less than 8 lakhs per annum. EBC is a reservation for Candidates belonging to BC Category whose annual income is less. So, you cannot belong to both EBC and EWS. So if you belong to EBC, you should select OBC-NCL. If you select EWS, you will not be able to produce the certificate as you belong to BC Certificate. And your admission might be cancelled due to failure of submitting relevant category certificate. If you have an EBC Certificate, you should select OBC-NCL and not EWS.