Hi,

Hope you are doing well. The seat allotment of JOSAA is done by considering JEE Merit and Choices filled by student. As per Notification released by JOSAA, Once choice filling order is done in first round , you can't change it in further round. You could only change that in Spot rounds or special rounds which are done to fill vacant seats of NITs, IIITs and GFTIs.

I hope this will be helpful to you.

Thanks!!!!