There are so many things that you don't learn about "the real world" while you are in school.  Here are some things I wish I had learned the importance of while I was still in college (or even earlier):

• Communicating (both writing and public speaking skills)
• Networking 
• Finding (and being) a mentor 
• Volunteering 
• Stretching my skills

Learning these early on would have saved me so much time, effort, and struggles in my career (though I am exceedingly happy with where I am at now).  As a result, I try to share them with everyone I come in contact with.  What are some things you wished you learned in school before getting into your career?