Dear Manoj,
Certification can be done in 2 ways.
First you can pay a big Amount of 2 or 3 lakh INR to SAP PARTNER Institutes and they would give class room training and materials and then through them you can write certification exam.
Second, you need to be working for a SAP Partner company or a company where SAP is implemented and there are few more conditions.
Regards
Shaik