There is no such thing as a one time payment with these blackmailers. I don't understand why he would go through with the deal considering the apprehensions that he already had. He got a gut feeling, a severe warning from his conscience, and yet, he followed through on this academically dangerous plan. If they do blackmail him, he brought it upon himself. Also, is he sure that we will not require their services during his academic career? Using an academic professional can be addicting for most students. That is how we make / made our living. If he is sniffed out by the university, since the entrance exam will be using an IP tracker, then he can kiss his academic studies goodbye. Most schools that use online exams have an IP tracker that is set to report back the location to the university and allows the system to block the "exam taker" from logging into the system. He will definitely get caught once the IP, regardless of their VPN provider, is pinged and reported. Tell your friend not to take what seems to be the easy way because the consequences affect his entire future. Take the test himself and hope that he passes. That is the best way.