Introduction:
When it comes to revising for the Agriculture Optional subject for UPSC, there are two common approaches - practicing answer writing and reviewing notes and textbooks. Both methods have their own advantages and it ultimately depends on the individual's learning style and preferences. Let's discuss each approach in detail.

Practicing Answer Writing:
One effective way to revise for Agriculture Optional is by practicing answer writing. Here are some reasons why it can be beneficial:

1. Application of knowledge: Answer writing allows you to apply the knowledge you have gained from your notes and textbooks to real exam-like scenarios. This helps in better understanding and retention of concepts.

2. Time management: Answer writing helps in improving time management skills, as you need to complete your answers within the given time frame. This is crucial for the UPSC exam, where time management plays a vital role.

3. Exam-oriented preparation: By practicing answer writing, you become familiar with the pattern and style of questions asked in the UPSC exam. This helps in developing a strategic approach to tackle different types of questions effectively.

4. Feedback and improvement: If you have access to a mentor or a study group, practicing answer writing allows you to receive feedback on your answers. This feedback helps in identifying your strengths and weaknesses, enabling you to make necessary improvements.

Reviewing Notes and Textbooks:
While practicing answer writing is important, reviewing your notes and textbooks should not be neglected. Here's why:

1. Conceptual clarity: Notes and textbooks provide a comprehensive understanding of the subject. Reviewing them helps in revisiting and reinforcing the core concepts, theories, and principles of Agriculture Optional.

2. Completeness: Notes and textbooks cover a wide range of topics and subtopics. By reviewing them, you ensure that you haven't missed out on any important information, thus making your preparation more comprehensive.

3. Revision of facts and figures: Agriculture Optional often involves the study of various statistics, data, and figures. Reviewing your notes and textbooks helps in revising these facts, which can be crucial for scoring well in the exam.

4. Understanding interconnections: Going through your notes and textbooks enables you to understand the interconnections between various topics. This holistic approach is important for gaining a deeper insight into the subject and developing a broader perspective.

Conclusion:
In conclusion, both practicing answer writing and reviewing notes and textbooks are essential for effective revision of Agriculture Optional. While practicing answer writing helps in the application of knowledge, time management, and exam-oriented preparation, reviewing notes and textbooks ensures conceptual clarity, completeness, revision of facts, and interconnections. It is advisable to strike a balance between these two approaches to make your revision more effective and comprehensive.