Yes, you can improve your 12th class marks while pursuing a BA, but the feasibility depends on the regulations of the educational boards and institutions involved. Here are the general steps you can follow:

1. **Check Eligibility**: Confirm with the education board (e.g., CBSE, ISC, State Boards) if they allow improvement exams for 12th-grade subjects while you are enrolled in a BA program. Most boards allow students to take improvement exams to enhance their scores in specific subjects.

2. **Application Process**: Apply for the improvement exams through the official board website or your previous school. You will need to fill out an application form and pay the required fees.

3. **Scheduling**: Ensure the exam dates do not clash with your BA course schedule. Improvement exams are typically held during a specific period, so plan your studies accordingly.

4. **Preparation**: Allocate sufficient time for preparation. Balancing BA studies and 12th-grade improvement exams requires effective time management.

5. **Attend Exams**: Appear for the improvement exams as scheduled. Perform well to achieve better scores.

6. **Submission of Improved Marks**: Once you receive your improved marks, update your academic records. These improved scores can be beneficial for future educational or career opportunities.

Consult with your current BA institution and the relevant education board to ensure compliance with all rules and procedures.