I am glad to read that you wish to improve your oral English language skills. Through your public profile, I have looked at some of your posts; your written English is not that bad, therefore, improving your oral abilities will be easy.
Ways to Improve Oral English Skills
There are lots of ways to improve; I suggest that you carefully listen to broadcasts delivered in English on radio and television, particularly interviews. I find NDTV particularly good (NDTV is available online). Also, try to listen to the BBC; this is good to improve pronunciation. While there are a number of books and audio CDs available, there is a chance that the listener will soon get bored and give up.
I hope the above helps.
Regards,
Harsh