There are so many traning courses listed on website, "CA API MANAGEMENT" is one of them listed under www.ca.com/us/education-training/learning-paths.html Is "CA API MANAGEMENT" course is sufficient to get certified as I am a beginner?
I would recommend that you get a few courses on CA API Gateway and Portal first and then on other advance components like OTK, MAG, Live API Creator and more to get advance training.
The Professional Exam at the end of the path is what is required to be certified in API Management - Technical Overview, Gateway, MAG and API Portal. I believe the Education team is currently working on a 9.x version of the exam.