Hi amruta sawant,
The BW on HANA certification is E_HANABW141(SAP Certified Application Specialist (Edition 2014) - SAP BW powered by SAP HANA).
The certification material code is BW362.I am afraid you might not be getting any examination material here in SDN as it is against the policy.Please contact SAP Education for that.
Also, please note that In order to be eligible to take this exam you have to have passed on of the following certification exams: SAP BW 7.3 certification (C_TBW55_73) or SAP BW 7.4 certification (C_TBW60_74,Under development) or SAP BW 7.3 professional certification (P_BIE_73).
BR
Prabhith