Offer rescinded?

Just had a question, at what final marks do offers get rescinded if i got in with ea. For context I'm from india (cbse) and my predicted final grades were around 91%, with the lowest in math (around 85%), with my mid year report having sent an 86%. my final exams are going on right now and i just wanted to know at what marks my offer could get rescinded at overall percentage wise and individual subject wise. got in for cs