1. Definitely doing C.A is a much better option for you. But you have to remember that the course needs complete devotion and hard labour. Furthermore, you are studying in a private sector bank, which may not have any fixed working hour. So, the study would require strong determination, patience and diligence. At the same time, you must not leave the job. Before the examination, you can take leave, but I would advise you not to quit the job, under any circumstance.
2. Shifting to other divisions/sectors of the banking industry depends upon your inclination, your office's (in this case, Axis Bank's) policy and requirement of staff in other divisions. It does not depend upon your wish. However, you can pursue the matter with the Bank management persistently to shift to your preferred Branch/Division.
"If you are killed in action, you go to Heaven. If you win, you rule this Earth (as beautiful as Heaven). That is why, O son of Kunti, take a firm resolve and fight!"-- Shrimad Bhagwad Gita