Hii

There's no official UP- specific schedule published yet for NTSE 2025 but for reference you can check the previous year pattern of registration and tentative here https://school.careers360.com/articles/ntse-application-form .

Most likely NTSE Stage 1 registration forms would release in August or sept.  You must keep eye on UP's SCERT website and stay tuned to NCERT and national exam portals, as they will publish official dates and links once available.