Can I sit for aaa and sbr together

I cannot say as it depends on too many factors. If you download the Study Support Guides you can use the “planner” to plan ahead your studies and revision::
https://www.accaglobal.com/caribbean/en/student/exam-support-resources/professional-exams-study-resources/p7/self-study-guides.html
https://www.accaglobal.com/ca/en/student/exam-support-resources/professional-exams-study-resources/strategic-business-reporting/study-support-guide.html
Since ACCA recommends students sit/pass SBR BEFORE AAA (as SBR exam docs except EDs are assumed knowledge for AAA) you should plan to complete your study of relevant SBR topics before studying how they should be audited. It’s less of an issue for revision where you should be able to attempt AAA questions with financial reporting issues – as long as you have studied them.

You might better consider concentrating on SBR for March and sitting AAA for June – you can always start on AAA studies sooner. If you attempt both with insufficient preparation you could fail both – just putting you under pressure to attempt both again in June.