Depends on how well can you prepare in the duration till end March.
Based on your question I assume you’re just starting to study both exams. It will be much difficult in that SBR has a huge syllabus while AAA is very technical and a significant portion of it depends on the knowledge of IFRS you study in SBR. If you’re just starting then I’d recommend to go for one exam only, preferably SBR.
On the other hand, if you have covered enough portions of both exams until now then attempting both could be possible. Nonetheless, you’d still need lots and lots of practice of past papers.
Take your time and analyse where you stand in terms of preparation and then make a decision.