Hi Chaitrav,

For the first round you have to fill the option form then based on this you will be allocated a college. If you don't want to go for it then you have to fill the second option form again for the second round and this process continues till third round. In this way, you have to fill separate option form for each round and also you can change the sequence of the choices in the form.

You can check details on https://fe2019.mahacet.org/staticpages/homepage.aspx

All the Best!!