Preparing for University (Summer Edition)

(This is something I have been meaning to post last year, but didn't have the time to edit and then eventually gave up completely. I decided to post this now since I have a little more experience and more advice for the new undergraduates entering their first year. So this post is a collaboration between me and my old self! How cute. ^_^ )
Feel free to use these tips whether you are a high school student or graduate.