You can register a student to add him or her to your currently selected test administration.
Pearson recommends that you register a student at the same time that you Create a Student Record. If the student record was previously created, you must select by Ignoring to find unregistered student records.
You can only unregister a student from a test administration when the:
Prerequisites
Student registration occurs after a student is enrolled in an organization.
You must remove all tests tied to that student record before you register the student.