Confused about transfer of articleship

Hello Friends...

I am doing articleship in a mid-level firm, my final attempt is due in November, 2015. I have been stucked in Audits (Bank's Concurrent Audit, Stock Audits, Internal Audits) only but no other works like Taxation, Returns and other official works. I want to work in Bank/Stock Market after clearing CA. Now I am confused whether I should change the firm so that I can get other kind of works also...as I have only 1.5 month to take decision. Please friends guide me what to do???

Thankyou very much in advance.