For Study Material, please go to http://www.hl7.org/library/training/index.asp. This is a page from HL7 International website that gives you information on study guide and sample certification tests for all the three certifications HL7 version 2.7, Version 3 and CDA R2.
Please note that HL7 Certification is awarded ONLY by HL7 International.
HL7 India conducts HL7 Certification Examinations on behalf of HL7 International.
No other organization is authorized to award HL7 Certification.