Engineering Entrance Exam

You need to appear for JEE and qualify for the said college. Then you will have to appear in counselling and choose the college you want as your first option. You will be allotted the college if you are eligible. NSIT is a good college hence you will need to study hard for it.

You need to have scored a minimum of 75% in your board exams. Apart from that, you need to either qualify KVPY-SA or SX with a rank as good as 250. The channel through JEE Mains/Advanced is quite difficult as they have extremely high cut-offs there around 250 rank which is very difficult to get as c

You can score above 180 marks out of 360 if you solve 40 years question papers.

You have to score an aggregate of 60% in the board exam. There is no such entrance examination, I mean for sure, you will get selected. The thing is to submit your application form in time.

Study text books thoroughly.Solve objectives.
Solve mock test as many as you can.
Learning the subject may lead you to success.
CBSE textbooks may help you for both board and VITEEE.

To get a good branch, you have to get your rank under 5k (CSE).
And, for other branches under 15k would be sufficient.

Yes, you can. But, it is a hard way to go on. It takes number of attempts to pass through. But, never leave your desire. Work hard.
All the best.

Joint Entrance Examination (Main) (JEE Main). Joint Entrance Exam Advanced (JEE Advanced). Birla Institute of Technology and Science Admission Test (BITSAT). Graduate Aptitude Test in Engineering (GATE). VIT Engineering Entrance Exam (VITEEE). SRM Joint Engineering Entrance Exam (SRMJEEE).