Sounds like a proof of work system is needed. Let’s say every answer included a something unique to the test taker, time, place and question. These values would

Sounds like a proof of work system is needed. Let’s say every answer included a something unique to the test taker, time, place and question. These values would be inserted early in the computational process, like maybe as a coefficient to sin, such that the process is easy to grade but difficult to cheat since the values of each downstream step are unique.