What you need: Scanner, printer 

Risk level: High

It doesn’t happen as much as we’d all like it to, but there are rare occasions when students get access to the test before the day of the exam. If you’re one of the lucky few to be the beneficiary of this largesse from the scholastic gods, take the exam, scan it, and print out a copy. Fill in the answers and bring the exam with you on test day. Pretend as if you’re filling out the test, and switch it with the pre-prepared one before the proctor collects the papers. If done correctly, no one will be the wiser.