Should I Start Looking For A New Job?

Ok so i have been working for my company for 3 years now. I have hated my Job since day 1 BUT it was benifits and a paycheck right out of college. I am currently going to grad school because this job has given me ZERO “experience”. Should i quit my job and start looking? Should i get a job in my field of current study of “Human resource?” Or do i wait until i have graduated which will be May of 2009 with a Masters degree???