Be sure of what you are going to speak and speak it confidently 
Practice it daily with your friends or family members .
Buy some good books of english eg. - book of Wren n Martin.
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Well, you should try to read as many books of English as you can, including story books. And i agree with shipra that you should read books of grammar like Wren and Martin. Talk to your friends and teachers in English. Make English speaking a habit,
or simply you can-
Walk in English, Talk English, Eat English, Sleep English, Dream English.......good luck!!!
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