In order to get an EWS quota you have to eligible in the following terms:

• Given only for the General Category candidates. 
• Family should have a gross annual income below Rs 8 lakh.
• your family should not own or possess agricultural land of size 5 acres or above.
• your family should not own or possess a residential plot of area 100 sq.yards or more in notified municipalities.
• your family should not own or possess a residential plot of area 200 sq.yards or more in areas other than in notified municipalities.

Therefore, a person with above conditions is given this EWS seat.