Yes, it is advisable to allocate separate time slots for working on weaker areas and practicing areas where you are already strong within your PSIR study plan. Here's why:

1. Identifying and improving weaknesses:
- Allocating specific time slots for weaker areas allows you to identify and focus on the areas that require improvement.
- By dedicating time to understanding and working on your weaknesses, you can develop a better understanding of those concepts, theories, or topics.
- It helps in bridging the knowledge gap and ensures that you have a well-rounded understanding of the subject.

2. Strengthening strong areas:
- While working on weaker areas is crucial, it is equally important to reinforce your strengths.
- Allocating separate time slots for practicing areas where you are already strong helps in maintaining and enhancing your expertise in those areas.
- It allows you to deepen your understanding, explore advanced concepts, and stay updated with the latest developments in those areas.

3. Effective time management:
- Allocating specific time slots ensures that you have a structured study plan and utilize your time efficiently.
- It prevents you from spending excessive time on areas where you are already strong, which could be better utilized for working on weaker areas.
- By managing your time effectively, you can strike a balance between strengthening your weaknesses and reinforcing your strengths.

4. Enhanced performance:
- By focusing on weaker areas, you can improve your overall performance in the PSIR exam.
- Understanding and addressing your weaknesses can boost your confidence and reduce the chances of making mistakes in those areas.
- Strengthening your strong areas ensures that you can maximize your potential and score well in those sections.

5. Holistic preparation:
- Allocating separate time slots for both weaker and stronger areas ensures a comprehensive and balanced preparation.
- It helps in developing a well-rounded understanding of the subject and equips you with the knowledge and skills required to tackle diverse topics in the exam.

In conclusion, allocating separate time slots for working on weaker areas and practicing areas where you are already strong is advisable within your PSIR study plan. It helps in identifying and improving weaknesses, strengthening strong areas, managing time effectively, enhancing performance, and ensuring holistic preparation for the exam.