Look at the National Scholarship Portal, your state scholarship portal, and the scholarship page of every college on your shortlist. Many ask for an income certificate, category certificate and previous marksheets.
Apply early, because portals close on fixed dates and verification can take weeks. Keep your bank account linked to Aadhaar, since most payments go straight to the student.
This guide is general information. Dates, eligibility and fees change every session, so confirm them with the institution or the official portal.