A systematic approach to mastering the Mains answer structure includes understanding the required format and style expected by the UPSC. Candidates should start answers with a clear thesis statement, followed by structured points that logically flow. Use of headings, bullet points, and sub-headings can enhance readability. Practicing time management during writing helps in covering all points adequately. Regular feedback from mock tests can also identify weaknesses in answer presentation. Developing a template based on frequently asked questions can further streamline the answer-writing process.