Hii,
Most of the people are very good in their Academics, but unable to speak in a group of people and on the stage. The reason behind that is the fear of speaking, which we call it as Communication Skill. Communication skill is nothing but sharing our idea effectively with other person. So start Interacting with people in English. There by you will get habituated to speak. Also See Some English Speaking Videos in YouTube and try to read English Newspaper.
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