How important are AP scores for transfers?

<p>I've seen a variety of credentials among prospective transfer students, and AP scores are almost always brought up. Some have 3, others have 10. Some have a few that were all self-studied, others have many, some of which were self-studied. What's a good number to have for Ivy League admission?</p>

<p>How much impact will they have on the final decision?</p>