India

No, the same institute offered various fake degree from its university Techno Global University. There are a lot of claims mentioned on its website but trust on your own due diligence.

50% is the minimum percentage for admission into a management program and test majorly depends on your performance in aptitude test. please check with Symbiosis and TISS. Others are ISB (admission through GMAT and highly competitive and rewarding), Manipal University. There are not other reputed institutes offering the course.

You should take admission in Nirma University or DAIICT.

Your HSC board exam doesn't matter for engineering college, you have to qualify for the entrance exam of engineering college.

You may opt for BITS Pilani, BIT Mesra, VIT University, SRM, Shiv Nadar University, Thapar University, NIIT University etc for B.Tech CSE. All these Institutes have good academics environment and placement records for brilliant students who give their 100% to studies.

Anna University, Jeppier Engineering College, Kumaraguru College of Technology and Raja Laxmi Engineering College are the top aeronautical engineering colleges in Tamil Nadu.

For aeronautical engineering, Maharashtra is the best option. Here I suggest you the top colleges in Maharastra:
IIT Bombay, VNIT-Nagpur, Government College of Engineering-Pune, Sandip University are some of the top colleges for aeronautical engineering.