You can try a few speech techniques when it comes to this but as long as you can use a good range of words at correct places while being grammatically correct and fluent, you should be fine. You can use a few of the tips to increase your score. - Listen to debates to increase the range and accuracy of your vocabulary - Record your own speech and listen to it for fluency and clarity - Listen to native English speakers - speaking in an official environment to understand how words are pronounced - Practice breaking down the words via syllabus to increase the accuracy of the pronunciation