B.Tech

As you have mentioned that you are not sure of getting 75% in boards, 40000 rank in JEE Mains is enough for you to grab NIT/IIIT/State government colleges but you need 75% in boards to be eligible for admission. Only private colleges can give you relaxation in board percentage, so you can try in JII

There is no such specialisation called cyber security existing in B.Tech and I hope you are aware engineering is a stream and B.Tech is a subject offered in this stream.

B.Tech+ MBA is a lethal combination to have for the Corporate World.
Benefits of pursuing MBA for Engineers
While engineering helps students in honing their analytical and mathematical skills, a managerial course makes them adept at fulfilling job roles in fields like investment banking, consulting, e

There are 2 deemed universities in Hyderabad:
1. ICFAI Foundation for Higher Education
2. International Institute of Information Technology, Hyderabad
For more deemed university follow the link:
https://en.m.wikipedia.org/wiki/List_of_deemed_universities

You can join Flying club to learn flying along with your Engineering education. You must plan your Engineering and flying training such that you obtain your CPL by the time you graduate. You can appear for CDS examination in final year of your B.Tech to join Indian Air Force as a Pilot.

As per your rank your chances to get a good government and private colleges are nit, so figure out what went wrong and prepare well for upcoming exams.