Ap cancellation?

<p>So basically my psych teacher did not teach us anything this year. I am signed up for the ap test, and am planning on "winging" it. Of course, I would do a little studying. But my main question is... If let's say I were to get a 2 on the exam would it be best to cancel the scores? I have been reading that colleges do not like that you selected only good scores to send in. But if you were to cancel the scores, how would colleges know otherwise if you did or didn't take the exam?</p>