Hello Kannan
If you don't have work experience on HANA then you may have to attend SAP training and go to certification through them only because you need to have atleast 6months of exp on hana if you want to go for direct certification.
the below link gives you list of certifications avialable
https://training.sap.com/in/en/search?query=hana&Delivery=certification
Regards
Raj