Dear Amrit, 

EWS Certificate and Income Certificate are not the same thing. 

But you don't need to worry as there is a remedy for you to extend the date of submission of Certificate by providing a Declaration by the Candidate in Lieu of EWS Certificate  .

This Declaration will allow you to submit the Certificate by June 5.

The Declaration is given on the next page of EWS Certificate Format provided on the official website of JEE Advanced. 

To know about the colleges that you will get, you can try Career 360 College Predictor 

https://engineering.careers360.com/jee-main-college-predictor