Drinking the answers
Here, we have an example of how effort begets results. We can see that sometimes, the preparation time can yield results when preparing for an exam. And we are not talking about studying. All you need here is an empty bottle and a printer, and you are good to go.
After all, who reads every ingredient in their vitamin drinks? Almost no one. So why would your teacher suspect an innocent bottle on your desk? You have to find the label online and replace the ingredient list with the answers for the test. Or you could use all that time and effort for studying.