If you appeared for your NIOS Class 12 exam in October 2024, your passing year will be considered 2024 (the year your result is declared).
For JEE Advanced 2026, candidates are eligible only if they passed Class 12 in 2025 or 2026.
So, since your passing year is 2024, you will not be eligible for JEE Advanced 2026, but you can still appear for JEE Main 2026.
Hope you understand.




