Hi

1 cent land = 435.6 sq ft

Then,

15 cent land = 435.6 sq ft x 15 = 6534 sq ft

I am extremely sorry but with residential area of 6534 sq ft you are not eligible for EWS as those with residential area of 1000 sq ft. and above are not eligible for ews

You can check ews eligibility which is provided below:-

-) you shouldn't be covered under the scheme of reservation for OBCs ,SCs and STs

-)your gross family annual income from all sources i.e. salary, agriculture, business, profession, etc. must be less than 8 lakh rupees

-) irrespective of the annual family income one won't be eligible for ews reservation if his /her family owns

a) agricultural land of 5 acres and above

b) Residential area of 1000 sq ft. and above

c) Residential plot of 100 sq. yards and above in notified municipalities

d) Residential, plot of 200 sq. yards or  above 200 sq. yards in  the areas which are those other than the notified municipalities.

You can check the same at its official page the link is provided below

https://dopt.gov.in/sites/default/files/ewsf28fT.PDF

Thank you