Yes they have fee remission in their colleges. And you are obc and also having less than 1 lakh family income , so they will give full fee remission of the tution fee, which is around 62500. 

Talking about income certificate then see , no one can give you the exact format.As it depends from state to state lso there are some criteria of colleges allso. Soyou should probably talk to the seniors of that colleges they will give you better information.

Thank you.