School coordinators can search for a student's existing Total Registration account across all exam types in your school and from previous years by going to the Report Center and clicking Search For Students.
You can search via a variety of information - student's name, email address, ID number, phone number, parent's name, and/or parent's email address. As long as one of those data fields was entered into the student's TR account in the past, you will find the student's information.