Yes, you can improve your marks through NIOS.

The National Institute of Open Schooling (NIOS) offers improvement exams for students who have already passed their 12th class from any recognized board. You can re-appear for specific subjects to enhance your overall percentage.

However, it's important to consider a few points:

• Acceptance: While NIOS is a recognized board, some institutions or employers might prefer the original board certificate.
• Time and Effort: Improving marks through NIOS requires time and dedication.
• Alternative Options: Explore other options like retaking the 12th exam through your original board or focusing on higher education.

Ultimately, the decision to improve your marks through NIOS depends on your specific goals and circumstances. Weigh the pros and cons carefully before making a decision.