To prepare for the Civil Services Exam 2018, particularly for the Polity section, follow these steps:

1. Understand the UPSC exam pattern: Familiarize yourself with the exam pattern, which consists of three stages – Preliminary Examination, Main Examination, and Personal Interview. Understand the syllabus and marking scheme for each stage.

2. Read the syllabus: Read the syllabus for the Polity section thoroughly to understand the topics you need to cover. The syllabus can be found on the official UPSC website.

3. Gather study material: Collect the necessary study material for the Polity section. Some recommended books for Polity include "Indian Polity" by M. Laxmikanth, "Introduction to the Constitution of India" by D.D. Basu, and "Indian Constitution at Work" by Granville Austin.

4. Make a study plan: Create a study plan that covers all the topics in the Polity syllabus. Allocate specific time slots for each topic and ensure you stick to the plan.

5. Understand the basics: Start by understanding the basics of Indian Polity, such as the Constitution of India, its features, and the organization of the government. Make sure you have a clear understanding of concepts like fundamental rights, directive principles of state policy, and separation of powers.

6. Read the Constitution: Read the Constitution of India thoroughly. Focus on important articles and amendments, as questions are often asked based on these.

7. Stay updated: Keep yourself updated with current affairs related to Polity. Read newspapers, watch news channels, and follow reliable online sources to stay informed about recent developments in the political and constitutional landscape of India.

8. Take mock tests: Practice mock tests and previous year question papers to get a feel of the exam pattern and improve your time management skills. Analyze your performance and identify areas that need improvement.

9. Join coaching classes or online courses: If you feel the need for additional guidance, consider joining coaching classes or enrolling in online courses specifically designed for UPSC preparation. These can provide structured guidance and expert insights.

10. Revision and practice: Regularly revise the topics you have covered and practice answering questions to enhance your understanding and retention. Focus on writing concise and precise answers.

Remember, consistency and perseverance are key to succeeding in the UPSC exam. Keep a positive mindset, stay dedicated, and maintain a balanced approach to your preparation.