Hidden in plain sight
Nowadays, the best and most efficient way to find the answer to a question in a test is to just look at your phone. You can prepare the answers before the test, or even if you forgot, you can google them and probably come up with a solution quickly.
Although some teachers confiscate their students’ phones, there are ways around it! You can bring them an old phone and give them that one, or you can get creative and hide it inside a book. The important thing is that you be clever about it, and that way you will never get caught.