Hi Anju,
after reading this thread i will suggest you to take a better step towards any authorised SAP training Center near you. Tell them about your prior work experience and ask him about any suitable module which relates to your previous work experiences.
Because simply taking a Certification will never gurantees a job for you, and you may get frustrated with new technology. So it would be more beneficial if you will do some research work before taking any step. Then it will be more fruitful to your career.
Best of Luck.
Regards
Sanjeev kumar