When you have a large number of exams to manage, it is easy to miss one out when putting a seating plan together.
Once a seating plan has been created, the only editing you can do is with adding or removing candidates for the exams *already* associated with that seating plan.
What you can't do is add an exam to an existing plan. Instead, you have to start all over as otherwise you cannot be sure that the pupils you are placing aren't already in occupied seats.
It would be great if the exams associated with a seating plan could be edited after the plan has been created.
