The case of the uploaded PDFs provides a bit more integrity in the system because handwriting can be verified. I would suggest taking a step back and finding out what the business need is for the students to submit the tests online. Is this a distance learning environment? Is there an issue with using paper? I guess I'm dating myself, but the processes as described seems to be a solution looking for a problem, which isn't clear from your question.
There are many educational learning systems available today that would allow students to take tests online. Filling out questions, either multiple choice or essay and having the data deposited into a database for grading, etc., would be a better option than the kluge that you described.
In terms of the public computer labs, I'm not sure how you would restrict access. In a university setting, students need to be able to access the systems from anywhere on campus. Are you suggesting that they can only take the tests, or upload the files from a central place? Again, that would seem to defeat the purpose of the automation in the first place.
That's why I'll go back to the first statement I made about authentication. If you have the proper way to verify identity, then where the students access the system or upload files doesn't really matter.
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