Introduction:
Constitutional law is a crucial subject for law optional in UPSC exams. It requires a comprehensive understanding of the Indian Constitution, its principles, provisions, and interpretations. Here are some specific tips to improve your understanding of constitutional law:

1. Familiarize Yourself with the Constitution:
- Start by reading and understanding the bare text of the Constitution of India.
- Note the structure, parts, schedules, and important articles.
- Pay attention to fundamental rights, directive principles of state policy, and fundamental duties.

2. Read Standard Textbooks:
- Refer to standard textbooks on constitutional law like "Introduction to the Constitution of India" by D.D. Basu or "Constitution of India" by V.N. Shukla.
- These books provide in-depth knowledge of the subject matter and help in understanding the nuances of constitutional law.

3. Case Studies and Landmark Judgments:
- Study landmark judgments by the Supreme Court of India that have shaped constitutional law.
- Analyze the reasoning, interpretation, and application of constitutional provisions in these judgments.
- Understand the principles of interpretation like literal interpretation, golden rule, mischief rule, etc.

4. Analyze Current Affairs:
- Stay updated with current affairs related to constitutional law.
- Analyze recent judgments, debates, and constitutional amendments.
- Understand the impact of these developments on the interpretation and application of constitutional provisions.

5. Practice Previous Year Question Papers:
- Solve previous year question papers to get familiar with the exam pattern and types of questions asked.
- Analyze the answers to understand the depth of knowledge required and the way questions are framed.

6. Join Study Groups or Coaching Institutes:
- Join study groups or enroll in coaching institutes that specialize in UPSC law optional.
- Engage in discussions, debates, and mock tests to enhance your understanding and analytical skills.

7. Revise and Consolidate:
- Regularly revise the topics you have studied.
- Create summaries, mind maps, or flashcards to consolidate your understanding and aid in quick revision.

8. Mock Tests and Time Management:
- Take regular mock tests to evaluate your preparation.
- Practice time management to ensure you can answer all the questions within the given time frame.

Conclusion:
Improving your understanding of constitutional law for the law optional subject requires a combination of reading, analyzing case studies, staying updated with current affairs, and practicing previous year question papers. By following these tips and maintaining a disciplined study routine, you can enhance your knowledge and perform well in the UPSC exams.