Yes it is possible to submit form with phone but the phone should have a scan copy of your documents to be upload. But it will be more convenient to fill it up with laptop . And regarding website please tell us in detail , what you are looking for.
For more detail go through the given link below:-
You can fill your NTSE form from a number of electronic devices such a phone or tab or laptop. If you are comfortable enough in reading the minute details and verifying your ID documents then you can fill it from your phone itself. The official page of NTSE allows you to.
But it is advised that you fill your form using a bigger screen so that the chances of error are minimized.
Hope this helps you.
it is advisable not to fill any education form or any organization form in mobile. if you make any mistake then your form will get rejected.
There is high chance to make mistake when a form is filled through mobile than from a desktop or laptop.
in case, it is important to check and verify all the details provided.
Visit the link :- https://ncert.nic.in/national-talent-examination.php
Hope it helps!