Allow students/parents to switch between classes for a given subject.

Give them the option to switch to another class (with vacancies) for a week (as they may have been away and want a 'catch up' lesson) or switch permanently. Also allow them to schedule this into the future (exact duration to be determined by the admin) if they know they are going away on holidays etc..

Would be great if you could also allocate within a subject, which class(es) the student could switch to.

For example, we have multiple classes that are for students from a specific school -- I would not want students from outside that school to be able to switch into it