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If you have failed in Mathematics but were admitted to a B.A. program based on your 12th-grade marks from the Arts stream, you typically have a couple of options:

1. Check College Policies : Different colleges have varying policies regarding admission qualifications. Since you enrolled based on your Arts marks, failing in Mathematics may not impact your current enrollment in the B.A. program. However, it's essential to confirm this with your college administration to understand how your specific situation is viewed.

2. Supplementary Exams : Many educational boards offer supplementary or improvement exams for students who have failed subjects. If this option is available to you, consider taking the supplementary exam to pass Mathematics. Successfully clearing this subject can help avoid any future complications regarding your academic record.

3. Focus on Your Current Studies : As you're already in the 5th semester, your focus should primarily be on completing your current courses and maintaining or improving your overall GPA. Your performance in other subjects will be crucial for your graduation.

4. Consult Academic Advisors : Speak with an academic advisor or counselor at your institution. They can provide tailored advice based on your situation, including how to handle the failed subject and any implications it might have on your future studies or career plans.

5. Future Studies and Career : If you plan to pursue further studies or a career that requires Mathematics, it's advisable to retake the subject and pass it to fulfill any prerequisites.

You can also refer to your college handbook or the official website for specific information regarding academic policies and support for students who have faced similar challenges.