Hello , 

As your query is you want to know that you have to fill the any empty form where you need to prefer 5 colleges and after that you want to know whether you have to fill the name of those five prefered colleges one second or except for the selected ones. 

The concept for re-applying for the preferences is just that in any case if you feel that you can go with some better options or you have found out then you can go with the earlier selected one, so there is not any such condition that you read need to repeat all the names provided with but you can go with some new colleges on you options as well. 

Thank you.