Why does willam deresiewicz think it is neccessary to unlearn before you can learn

According to William Deresiewicz, it is necessary to unlearn misinformation about anything before you learn and mix up that information with wrong information.

Explanation:

William Deresiewicz is an author and former professor of English. He asserts that college is all about having fun and finding out what excites you the most rather than becoming soulless achievers. For this they should be in the right mindset; to worry less about the grades and not become afraid to make mistakes, unlearn the wrong things and learn again the right thing.