Alibaba Cloud provide a lot of courses, some are free and now still have a lot of discount with very low prices. You can join any events from Alibaba Cloud, sometimes they give us some credits that you can buy anything from Alibaba Cloud products including courses or exams. Here is the webminar resources: Alibaba Cloud Online Videos.
You also can try the free courses on Coursera that are also very useful for exam and getting more knowledge about Alibaba Cloud here on Alibaba Cloud Academy Online Courses | Coursera.
Here is also very helpful FREE course about Alibaba Cloud Native with some free exams: Public Courses on Cloud Native Technologies.
You can also join the Alibaba Cloud Community – India (Bangalore, India) that is often provide free webminars and courses, and a lot of more.
Alibaba Cloud is also provide a lot of helpful documentations of every product that very useful for exams and the use of the Alibaba Cloud products.