SAP

Yes, it is a good idea. Take certification from authorized centers only like Genovate, Atos etc. If you are planning for a certification along with class room training it will cost you over 350000 INR from an authorized center. If you go ahead with training from a normal training center, it will cost you around 30000 INR in places like Delhi and Bangalore. In Hyderabad it will cost you only 10000 INR.
SD, MM, FICO, HR and TM are few of the modules which are pretty widely and extensively used by SAP ERP customers.

To know about SAP, kindly refer to the link mentioned below:
http://www.saponlinetutorials.com/what-is-sap-erp-system-definition/
Yes, you are eligible for pursuing SAP.

You can join NIIT for SAP training in Haldia.

SAP ABAB certifications will be the best option for you as you can become SAP programmer. If you want to be a functional consultant you can chose any management function of your interest.

SAP MM, original certifications by Siemens costs around 3 lakhs. It has great job opportunities. PGDM in marketing, the fee structure depends on the institute, IIMs have increased their fee a lot. Currently, it is around 12-25 lakh rupees.

For admission details, kindly visit the link mentioned below:
http://www.mrsstu.ac.in/admissions.php

1. Lithan Genovate – Bangalore.
2. SAPTree Technologies Pvt. Ltd. – Bangalore.
3. SAP Centre – Bangalore.