Proven techniques for mastering the art of writing effective essays include practicing a clear structure, incorporating compelling arguments, and using coherent transitions. An effective essay typically has a strong thesis statement, ensuring all points align with the main argument. It's crucial to engage the reader with a captivating introduction and to summarize key points in the conclusion. Regular feedback from peers or mentors can help improve writing skills. Additionally, reading various high-quality essays can expose candidates to different writing styles and techniques, enhancing their own capabilities.