Extension after Master's Degree

[jackjung.123]

Hi everyone,

My first visa was granted from 20/07/08 - 14/04/10. It was for Bachelors course for final year at the University. But because I failed in one paper so I had to extend my visa for further study. So I extended for 4 more months until 14/08/10. That makes altogether 25 months in tier 4.
I got my PSW from 18-08-2010 to 18-08-2012.
I extended my student visa from 12-08-2012 until 14-04-2014. That makes 21 months including 4 months extra period.
So altogether that makes 3 yrs and 8 months including 4 months extra time.
My question is, would I be able to extend my visa for ACCA 18 months course or Level 8 diploma course which is of 18 months to 2 yrs ?

I am finishing my Master degree in couple of months and wondering If I can extend my visa beyond this period.
Your advice will be highly appreciated.
Thank you