You need to question yourself, what is your goal? SAP course itself is not a goal, It is one of the steps to achieve a goal.
If you want to learn about how to use the s/w in a particular inductry or sector, the you’d need to go through the courses suitable for that.
As you are doing marketing MBA, you may be interested in SD or SCM. Or you may be interested in the Finance or Project Management. No one else can answer the question for you.
Then you need to see your short term and long term goals. Accordingly learn or do the courses to obtain the skills when would help you achieve the goals.
Go through the SAP website and then look for courses and their contents. This would help you further.