NSTSE 2020 (National Level Science Talent Search Examination)  was held on December 4, 2019 for students applied through schools, while for the applicants applied individually or directly, the exam was conducted on December 15, 2019. The results are also declared for the same. However, the notification for next year is nt out yet.

You can check following link for detailed information:

https://school.careers360.com/exams/nstse

Good Luck