Canadian Payroll Association exam CHALLENGE

Hello, I will appreciate if anyone who has done it can answer my question. I have been trying to get the answer from CPA but not getting clear answer. I am planning to take Challenge exam for payroll association certificate instead of taking classes or doing on line course/classes.
What I do not understand is how "proctor" thing works, as they require exam to be taken in front of proctor.
Thank you in advance