> being able to amend my answers after grading for a revised score
How do you expect that to work? After the exam, you talk to your friends (and to ChatGPT) and know the correct answers even if you could have never produced them during the exam.
Not the person you're replying to, but I've had some courses in which you received your graded exams and had an opportunity to regain some points by choosing some number of incorrect responses and redoing the work to obtain a correct answer.
This was pre-LLM, but you could cheat back then too. LLMs make it a bit easier by showing you the work to "show" on your corrections.
How do you expect that to work? After the exam, you talk to your friends (and to ChatGPT) and know the correct answers even if you could have never produced them during the exam.