Adjusting your study plan to accommodate specific areas within the geography optional syllabus where you need to focus more due to weaker understanding or lack of familiarity can be done by following a systematic approach. Here are some steps you can take to effectively address these areas:

1. Identify Weak Areas:
- Carefully go through the syllabus and previous question papers to identify the areas where you face difficulty or lack familiarity.
- Analyze your performance in mock tests or previous exams to pinpoint the specific topics or concepts that need more attention.
- Seek feedback from mentors, teachers, or fellow aspirants to get insights into areas where you struggle.

2. Prioritize the Topics:
- Once you have identified the weak areas, prioritize them based on their weightage in the syllabus and previous years' question papers.
- Select the topics that are more likely to be asked in the exam and those that carry higher marks.
- Focus on the foundational concepts first before moving on to more advanced topics.

3. Break Down the Topics:
- Divide the identified topics into smaller sub-topics or chapters.
- Create a study plan that allocates specific time slots for each sub-topic.
- Ensure that you have enough time for revision and practice questions related to each sub-topic.

4. Gather Study Material:
- Collect relevant study material such as textbooks, reference books, notes from coaching institutes, or online resources like EduRev.
- Ensure that the material you choose is comprehensive and covers the entire syllabus.
- Use different sources to get a holistic understanding of the topics and to gain multiple perspectives.

5. Allocate Time for Study:
- Allocate dedicated time slots in your daily or weekly study schedule to focus on the identified weak areas.
- Make sure to have a balanced study routine that covers other subjects as well.
- Stick to the schedule and avoid procrastination.

6. Adopt Effective Study Techniques:
- Use different learning techniques like making notes, creating mind maps, using mnemonic devices, or teaching concepts to someone else.
- Practice solving previous years' question papers and sample papers to familiarize yourself with the exam pattern and improve time management.
- Engage in group discussions or join online forums to clarify doubts and gain new insights.

7. Seek Guidance and Support:
- Seek guidance from subject experts, teachers, or mentors to clarify your doubts and gain a deeper understanding of the concepts.
- Form study groups with fellow aspirants to discuss and learn together.
- Regularly review your progress and seek feedback to ensure that you are on the right track.

Remember, consistency and perseverance are key to overcoming weak areas in your geography optional syllabus. By following these steps and maintaining a disciplined approach, you can improve your understanding and familiarity with the specific areas that need more focus.