There are two paths to certification. Subscribe to the SAP Learning Hub or take an Instructor-Led Training (ILT) course to prepare for SAP certification (in either case, be sure to take advantage of the free SAP Learning Journeys at learning.sap.com!).
When you are ready to take the exam, you will need a subscription to the SAP Certification Hub. The subscription is valid for 12 months and covers all available exams in the Certification Hub. You can then schedule a maximum of six exams within this 12-month period.
There are several subscription options.