Firstly before I write anything, it would be best and ideal for you to begin working.
Secondly, without hunting for another job, please do not quit your job. Since the job markets are looking out for more off less trained people, who are open to learning, which becomes difficult once you acquire degrees and work experience.
A job in hand, helps you demand from companies where you apply.
Right now, if you are looking out for an HR job, search well, and get into a basic start profile, whether SAP is implemented or not, or you are working in that module or not. There are lot of HR ou