DREAM Act WHAT?

In all honesty, this DREAM Act situation is quite unclear to me. How it's stated in articles is very confusing. But how I'm understanding it to be is that "immigrants who are undocumented, who completed two years of college or military service who came here before the age of 15 can have their path to citizenship." Now I got that quote from an article, but if they are undocumented how did they complete 2 years of college in the U.S.? Anyway, we currently have a job shortage so I think it would be best of we didn't allow more people in the U.S. because quite frank we need all the jobs. We also already have alot of people in the U.S. so why more? Then again we would have more in the military. It's just a difficult situation. I don't know my feelings on it. What are yours?