In Enriching Students, there are circumstances under which a student will be prebooked to their advisory. Those circumstances are discussed here and here.
To determine if prebooking will take place in your school, an Admin will have to configure your schools account.
How To Set
As stated above, the ability to set these values is only available to staffers that are Admins in Enriching Students.
Once logged on, go to Settings, Configuration. On this page, look for Prebooking Settings. You will see five check boxes, Monday - Friday. If the day is checked, it means that a new student will be prebooked into their homeroom for that day.