Dear Student
Yes you can go for CA  along with your bba.
Its good to see that you want to do two things at a time.
You can give CPT and then continue studying and giving exams yearly. All the best.
I hope it was helpful for you

Yes. You can definitely do it.
You have to clear an entrance exam CPT.

If you are HSC,  u can register with ICAI for Entrance Exam (CPT).
For Pursuing CA,  u should be From Accounts and Taxation.
Not Maths Required in CA.
for CPT,
Session I
Section A Fundamentals of Accounting - 60 Marks
Section B Mercantile Law - 40 Marks
Session II
Section C General Economics - 50 Marks
Section D Quantitative Aptitude - 50 Marks

Thanks,
Azim