Hello Kishore,

Yes, you can still complete your 12th grade through alternative methods if traditional school admission is not possible. Here are your options:

1. National Institute of Open Schooling (NIOS) : NIOS offers a flexible option to complete your 12th grade through correspondence or open schooling. You can enroll, choose your subjects (Commerce with Computer Application is available), and study at your own pace. The exams are conducted twice a year, and it's recognized by universities for further education.
   
   

2. State Board Open Schooling (if available) : Some states have their own open schooling boards. You can check with the Tamil Nadu State Board for any open school options they might provide.
   
   

3. Private Candidates : Some state boards allow students to appear as private candidates for the 12th board exams. You can inquire if Tamil Nadu State Board allows this.

These options will allow you to complete your education without regular school attendance.

I hope this answer helps you. If you have more queries then feel free to share your questions with us we will be happy to assist you.

Thank you and wishing you all the best for your bright future.