Yes, you can definitely appear for the 12th again through NIOS with PCM subjects.

This will make you eligible for JEE exams.

However, your previous PCMB degree will still hold validity. It won't be replaced or affected by the new NIOS certificate. You'll essentially have two 12th certificates.

Important Considerations:

• Time Management: Balancing NIOS studies and JEE preparation will be challenging.
• Eligibility Criteria: Ensure you meet the specific eligibility criteria for JEE, especially regarding age limits and other requirements.
• Exam Strategy: Develop a focused study plan to excel in both NIOS exams and JEE preparation.

Remember: While this is a potential path, carefully evaluate if it aligns with your long-term goals and if you're prepared for the academic and time commitment involved.

hope this helps you!!

Many students face same issue during prepration time and make wrong decision so i suggest you to rethink about your decision and choose best stream according to your interest and which will work for you in future.now coming to the question yes you can do it from nios without giving 5 subjects exam.just fill the private form with one subject and start preparing.all the best'.