1. Create a study schedule: Allocate specific time slots for each subject, including history optional. Divide your study hours effectively to cover all the topics. Stick to your schedule and avoid procrastination.

2. Prioritize topics: Identify the important topics in history optional based on previous year question papers and syllabus. Focus on these topics first to build a strong foundation. Allocate more time to difficult and crucial topics.

3. Refer to standard books: Choose the right study material and refer to standard books for history optional. Some recommended books include 'India's Struggle for Independence' by Bipan Chandra, 'History of Modern India' by Rajiv Ahir, and 'Ancient India' by RS Sharma. These books provide comprehensive coverage of the subject.

4. Take notes: While studying, make concise and organized notes. Summarize important concepts, dates, events, and their significance. These notes will serve as a quick revision tool before the examination.

5. Practice answer writing: History optional requires a good understanding of concepts and the ability to present them effectively. Practice writing answers regularly to improve your writing skills and time management. Analyze previous year question papers and model answers to understand the expectations of the examiners.

6. Join a test series: Enroll in a reputable test series specifically designed for history optional. These test series will provide you with practice papers, evaluate your answers, and provide feedback. Regularly participating in test series will help you identify your weaknesses and work on them.

7. Revise regularly: Allocate dedicated time for revision. Regularly revise the topics you have studied to reinforce your understanding and retain information. Use flashcards, mind maps, and mnemonic techniques to make revision engaging and effective.

8. Stay updated: Keep yourself updated with current affairs related to history and archaeology. Read newspapers, magazines, and online sources to stay informed about recent discoveries, research, and debates in the field of history.

9. Seek guidance: If needed, seek guidance from history optional experts or join coaching institutes that offer specialized guidance for this subject. They can provide valuable insights, clarify doubts, and help you streamline your preparation.

Remember, consistency, discipline, and perseverance are key to success in history optional and other UPSC subjects. Stay motivated, maintain a positive mindset, and keep working hard towards your goal.