Though your sentence structure should be fluid and rhythmic, you must also take care to use punctuation correctly. Failure to do so can lower your overall score. In addition to using proper punctuation, you must also use words effectively and accurately. Do not use large words to sound impressive if you do not know what they mean or how they should be used, but do not only use simplistic language, either. After you have completed your essay, take a moment to reread what you’ve written and correct any errors in grammar, punctuation, or usage.