Abhay,
I am working currently in a HANA project. No, I am not a fresher.
Regarding material watch the videos in SAP HANA Academy and sign up for one month free trial of SAP HANA and start practicing. Also, download SAP HANA modeling guide, SAP SQLscript, SAP SLT Document, SAP DXC, SAP HANA Data Provisioning, SAP HANA BOBJ Reporting, SAP HANA RDS.
SAP HA 300 and SAP HA100 would be helpful. Since these are copy righted material you have to buy them from SAP website.
I purchased this book from SAP Press: NEW SAP HANA Introduction Book 2nd Ed by Penny Silva and Dr. Bjarne Berg.
This book is very good and a handy resource for your exam and beyond.
Also, check out Dr. Berg's website from Lenoir-Ryhne University.
Dr. Bjarne Berg's Homepage - Lenoir Rhyne University
If you download freely available SAP material, hang out at SAP HANA Academy, SAP BI Tutorials, and Practice using Free Trial, you should be ok with your certification exam.
You have to start somewhere and you will get an idea where to look for additional help.
All the best for your exam.
Thanks,
Rajender