Setting a school as closed after you have Moved to the New School year

If you have a campus that is closing you need to set the school closure date

Go to Setup, School, School Configuration and edit the Configuration section: 

Select the Closed After option and enter the date.

Now you will need to set all the students as Withdrawn status and the Retirement Date to the first day in the school calendar using the Assign all of a field option from:

Menu, Student tools, Utilities, Assign all of a field