No, we are not suggesting you pay your teacher to help you pass the tests. We are talking about file corruption. When you are about to run out of time on your deadline and haven’t finished yet, you can send your teacher a corrupted file that they can’t open.
Many websites will corrupt a file for free or try it yourself by changing its extension. There is little chance they will check the file immediately after you send it to them. That will give you a couple more hours to keep on completing the assignment.