Today I failed AAA at 29%. Not sure which exam is easiest to pass:
AAA ATX or AFM
Go for the combination AAA + APM.
These are the best and easiest of the optional exams and you will be able to write them with SBL or SBR or both of them together.
The easiest optional paper is ATX with better passing rates than the rest. AAA is the lowest passing rate as shown on ACCA website past passing rates.
It also have to depend on what specialization you want to work for in your career when you choose the option papers. AAA with SBR is best combination as its related.
You can use your second level results (AA, TX and FM) as a reference on which you score better and you think you can do better.
29% shows need to build up on more understanding. Writing more points than what the exam paper marks required is important as well as writing relevant to the case. Time management for AAA is critical as there's a lot to write. My friend did twice before passing and these tips are valuable considering from a self study mode.
