Please help.

hi amulya

in case any person leaving India need to file form No. 30C of income tax 

u need not to certify any thing just the person leaving himself has to sign the form.

you can download the form from income tax site or can jst copy paste the below given link

https://law.incometaxindia.gov.in/DITTaxmann/IncomeTaxRules/pdf/itr62Form30C.pdf

hi

                  You need not to sign the form, the person migrating himself has to sign the form. 

you can charge for your consultancy