Hello Barun,

I am sorry but a person coming under an OBC quota cannot apply for the EWS quota. The eligibility of EWS quota states that the person should not come under either SC, ST or OBC quota and the family of the person should have a gross annual income that is under 8 Lakh per annum. If you belong to wither of the SC, ST or OBC quota then you are not eligible for EWS quota 

I hope this helped. 

All the best!!