If you are registering for the CHES examination as a full-time student, an advisor letter must be submitted at some point during the application process. Although the advisor letter is not necessary at the time of payment, it must be acquired and uploaded/mailed/emailed before the exam final deadline.
The goal of an advisor letter is to demonstrate:
That the applicant is enrolled in 9 or more credits (which secures the student rate)
When the student is expected to...