Exam

Yes you can get admission at this rank on your desired branch:
1-Dr Bhim Rao Ambedkar University
Agra
COMPUTER SC. & engineering. (SHIFT-I)
Closing Rank:30566
2-Dr Rammanohar Lohiya University
Faizabad
COMPUTER SC. & engineering. (SHIFT-I)
Closing Rank:31016
3-Dr Shakuntala Mishra Rastriya Punarvas Universit

It's good that you want to go to NDA. In my opinion, please don't drop and continue your UG course and with that you should prepare for NDA also and if you clear the written exam, then you should go for coaching of SSB at Col. Dagar Academy, Gurgaon as this is the top coaching institute for SSB in I

Check it out here:
https://www.google.co.in/url?sa=t&source=web&rct=j&url=https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor&ved=2ahUKEwiz1-Ckk7TbAhXLq48KHUJKCFQQFjAAegQICRAB&usg=AOvVaw1N9BzFtyUCP4JU-2UQHQ0H

Hii Mayank,
Please apply at:
http://tehadmissions.gov.in
for taking admission in YMCA.
Surely you can get admission into CS and IT trades.
There is physical counselling also in the last for leftover seats so try till the end; you will surely get it.
My best wishes.

With your OBC rank, you definitely have a chance of getting a government college. Keep an eye on counselling, it might take the last round but you are going to get it. Good luck.

Dear,
You are to score 75% or more in average or you are to be within top 20 percentile (5% relaxation for SC/ST) in +2 Board Examination. Then with the merit list of JEE Main followed by JEE Advanced, you may be shortlisted and asked for counselling in IITs.

For the B.Tech exam, you have to opt for only paper 1, but for the B.Arch exam, you have to opt for both papers.
Based on both papers, marks are evaluated and ranks are decided.
Rest wait for the results.
Best of luck.