Many oversea friends surprise that I have learned English for more than 10 years but I have poor Oral English skill. It may due to incorrect learning way. I am praparing TOEFL testing, the speaking part is quite difficult for me, if there is any suggestion given, I will be much appreciate.:)

Hi buddy don't worry the only way to speak english fluently is read news papers loud that u hear the sound and watch news and intonate according to that and try talking by standing in front of a mirror u will definitely succeed and see the diff
Best of luck siddhu

Best way I can think of is to try and find someone who has English as a first language and talk to them. Barring that it is pretty difficult.
As some suggestions I will rewrite your question.
First;
Many oversea friends surprise that I have learned English for more than 10 years but I have poor Oral English skill. It may due to incorrect learning way. I am praparing TOEFL testing, the speaking part is quite difficult for me, if there is any suggestion given, I will be much appreciate.

Now my version.
Many of my friends are surprised that I am learning english and have been doing so for 10 years. But my actual speaking skills are not very good. I will be tested in a few weeks and the speaking part is difficult for me to learn. Does anyone have any suggestions?
See the difference?
One may be proper English and the other is conversational English.