You can change your caste from General to EWS category today only. 
You can download further information from JEE mains official website . PUBLIC NOTICE EWS

Imp information is that you shouldn't have the following
I. 5 acres of agricultural land and above;
II. Residential flat of 1000 sq. ft. and above;
III. Residential plot of 100 sq. yards and above in notified municipalities;
IV. Residential plot of 200 sq. yards and above in areas other than the notified municipalities

Please ensure that if you can make certificate for Ews than only choose EWS . Otherwise you will face problem during admission..
Thank you..

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