Practice is the key. Identify your weaknesses first in speaking. Plan and instigate a strategy to overcome it. you should achieve your desired results eventually then. In speaking you are marked on your ability to communicate on the spot for the questions triggered at you. Not relevancy, but fluency, pronunciation and accurate grammar. Find a speaking partner to practice. Try to use some idioms, linking words naturally while you are speaking. Use more synonyms for common words like good, bad, like, enjoy, etc. Pardon me if I am repeating 8what you know already.