If you think there is any way around the research, you are mistaken. The number one tip here is to take out time for a thorough and profound analysis of the essay question. Other than this, draw connections between different events to evaluate and analyze the topic and hand. Another valuable piece of advice while writing this type of essay is never to write it in one sitting. Take your time; critical evaluation is not an easy task. Make sure you cover all aspects of the event or person you are writing about.