HI HARSHITHA CHANDREA JAMI,
after research i found that they dont really upload the format for income certificate. but you can take the format from here:- http://bsw.iitd.ac.in/stuff/forms18.pdf
i would suggest you to mail their official staff once to clarify and know for sure.
hope it helps
Candidates can check B.Tech Cut off for Top IITs & NITs here.
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile