Hi Pranjal, 

You can get the NTSE application form both online or offline from the liaison officer of your state. You, however, have to fill the application form manually and sumbit it at your school. Candidates also have to remit application fee if specified by the State/UT exam conducting body. For more details, you can check the following link:

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https://school.careers360.com/articles/ntse-application-form

Students can fill ntse application form in online mode on website orbalso collect forms from liasion officer for filling in offline mode. 

Application form is for both stage combined and can be submitted in offline mode only. 

Each union territory and state has released form below for download  

https://school.careers360.com/articles/ntse-application-form