Hi

The authorities will release the registration form in online and offline mode.The application form is expected to release in Oct/Nov 2021. The last date varies as per the state.The candidates have to download the ntse form from the official website.For ntse delhi there is no fee. They have to apply online through schools. For more detailed information you can check the following link

https://www.google.com/amp/s/school.careers360.com/articles/ntse-application-form/amp

https://school.careers360.com/articles/ntse-delhi