Quick W-2 question, how much do you suppose?

So I'm single, MAY be claimed as a dependent, have two jobs, and I've claimed S-02 for exemptions during the 2011 year. Am I going to be hit with a tax bill come next year? If so, are there any standard deductions I can claim, even if I'm not in school and I'm borderline poverty level? Any advice would be great! (Yes, I'm a first-time filer.) Thanks!