Hi Sourish,
First of all don't be sad if you couldn't qualify in the list. The thing that matters is that you tried. There's a long way to go buddy.
Regarding your query, many state governments do publish the official marks list of the marks scored in NTSE. Do visit the official website regularly and check the updates.

If you state doesn't provide you the same information, then you follow the given steps:

1. Draft a RTI.
2. Paste the required Postal Stamps.
3. Post the letter to the given address,

Public Information Officer

F.No (http://f.no/) . 1-4/2014-RTI Cell(PIOs)
National Council of Educational Research and Training
Sri Aurbindo Marg, New Delhi-110016


All the very best!
Feel free to ask me if you have any further doubts.