There are anumber of faill safes built in to Exam Compiler for typcial scenarios that may occur from time tio time

If all students miss an exam. The exam can be sent back to the exam bank and rescheduled

A student cannot wenter an examination past the end time of that exam.  At whcih time an alert will appear to the student within Examination Center advising of a missed exam

Any graded exam can be edited.

Two students cannot log into the same Examination User Interface at the same time.