You may require single recognition information to enter an exam process. For a process that is designed this way, you will first need to transfer valid candidate recognition information into the system. In this case, only those who correctly write the candidate recognition information you transfer to the system are accepted for the exam.
Candidate Recognition Information can be anything you name. For example:
Alternatively, you can ask the system to generate a unique invitation code for everyone. In this case, only those who write one of the generated invitation codes will have access to the exam.