How to get SAP HR Certification?

List of available certifications:

Two levels of certification for are available. The first being 'Associate' level, which means the candidate is qualified to apply his skills practically but under the experts' guidance in a project environment. The contents of the exam are based on a course material. The second is 'Professional' level and is based on real world SAP experience. The contents of this exam are not based on any course material but on project experience. 

Associate level:

SAP Certified Application Associate - HCM Payroll with SAP ERP 6.0 EhP5 - This certification tests the candidate for proven skills and fundamental knowledge in the area of SAP HCM Payroll.
https://training.sap.com/shop/certification/c_hcmpay_65-sap-certified-application-associate---hcm-payroll-with-sap-erp-60-ehp5-g/ 

SAP Certified Application Associate - Human Capital Management with SAP ERP 6.0 EHP5 - This certification tests the candidate for proven skills and fundamental knowledge in the area of the SAP Human Capital Management.
https://training.sap.com/shop/certification/c_thr12_65-sap-certified-application-associate---human-capital-management-with-sap-erp-60-ehp5-g/ 

SAP Certified Application Associate – Human Capital Management with SAP ERP 6.0 EhP6 -  This certification tests the candidate for proven skills and fundamental knowledge in the area of the SAP Human Capital Management.
https://training.sap.com/shop/certification/c_thr12_66-sap-certified-application-associate--human-capital-management-with-sap-erp-60-ehp6-g/certification-details/ 

Professional level:
SAP Certified Application Professional - HCM Talent Management with SAP ERP 6.0 EHP4 - This certification tests the candidate for an advanced project experience within this consultant profile and can implement this knowledge practically in projects under guidance of an experienced consultant.
https://training.sap.com/shop/certification/p_hcmtm_64-sap-certified-application-professional---hcm-talent-management-with-sap-erp-60-ehp4-g/ 

SAP Certified Application Professional - HCM Workforce Process Management with SAP ERP 6.0 EHP4
https://training.sap.com/shop/course/p_hcmwpm_64-sap-certified-application-professional---hcm-workforce-process-management-with-sap-erp-60-ehp4-classroom-064-g-en/