Hi @ChanderMohan ,
As a beginner in Adobe RT-CDP or any other Adobe tools, I would suggest to start with professional level certification followed by expert and master. Below steps are my suggestions for preparing for Adobe certification.
1) Follow exam guide in details for topics learnings
2) Refer experience league documentation for the topics
3) Do SPP trainings
4) Do hands-on in tool sandbox if you do not have prior experience with the tool
5) Appear for practice test for each exam and analyze result
Also please see this webinar recording (on SPP) of SME experience and guidance on certification.
https://solutionpartners.adobe.com/solution-partners/home/learn/enablement/partner_webinars.html