Rank: I am little worried about my admissions in IIT. What are the other options suppose if I don’t make it ?
In order to get a job in a well reputed channel like Discovery or National Geographic, the best course option for you will be
Media (Especially Electronic Journalism)
Apart from the above mentioned fields, you can also try for Media management.
To start a career I would suggest you to join some good production house or an AD agency as a trainee to groom yourself or another good option for you can be to start shooting documentary films, do it as a free lancer or join any NGO and make a documentary for them and then you can apply to big production houses or if you have enough funds you can start your own production. But first i would suggest you to go for film making course.
However, The best way to learn is by becoming the apprentice of senior.