Current state of the art in remote proctoring of exams is for students to be monitored via a webcam by a real person. As the exam is uploaded there is still room to cheat or to have someone else impersonate you. Handwritten exams have to be scanned at the end for upload. This service is not really available right now due to the lockdown and Universities are scrambling to find solutions that any way secure.
If you write out your exam via goodnotes and you can record the forward facing cam and attach the two as a file this might open up a very big market for you. Currently you cannot record if the camera app is shut so goodnotes would have to implement this. You also need to write with the iPad upside down so that the forward cam is at the bottom of the screen or otherwise it likely wouldn't pick up the student's face.