Dear Aspirant 

First of all Congratulating you on your nice performance and I would like to tell you that you can get your income certificates made just by visiting tehsil of your District and asking lekhpal to to so after filling a form for applying. After that you may receive it with in a weak. Nowadays these can be apply online. You can get online the same.

Good luck for your future :) 

Feel free to ask if you have any further queries.