It's depend on weather you are taking admission for professional course or and other course

but some documents are necessary for all course

You identity (Adhar card as primary)

your Transfer Certificate (TC from former school)

you Score card (Any entrance exam score card)

Category certificate if any or EWS if any

These are important documents common in al admission
But your school demand more document based on where you are taking admission so keep ready every possible documents before admission to avoid any issue