IHM Gangtok - Institute of Hotel Management

http://www.ihmctan.edu/programs.html
IHMs are the leading places that everyone craves for and prepares well. It is not impossible but the focus on the basic things that they ask is must for anyone.
NCHMCT-JEE is the criteria that they ask for. You score shall matter a lot in addition to the 77.4 that you are mentioning.
http://nchm.nic.in/ has the details to make you apply. I fear that the last date was in March.
17th March to 3rd April I guess. Please check the NCHM website.

Tarun,
If you want to do be a chef and you are clear about your aim then go for culinary colleges. If you have a slight doubt regarding the same, I will suggest you to opt IHM and pursue the cooking/bakery courses with it.

If you are from general category, you need to have a rank between 15-400 for best College that includes IHM Pusa, Bangalore and Mumbai. If you are from OBC, you can have rank till 1800 for Pusa 5000 for Mumbai 9000 for Bangalore.

There are many institutes you get into-
IHM Kovalam
IHM Srinagar
IHM Shillong
IHM Hajipur
IHM Gurdaspur
IHM Guwahati
IHM Gwalior
IHM Shimla

Hi, IHM-Gangtok is not good considering the placements and exposure. It is no where in front of the top IHMs such as Delhi, Mumbai, Bangalore etc. Some good private IHMs are -
International Institute Of Hotel Management
Christ University
Rizvi College Of hotel management, Mumbai
IP University
IHM Aurangabad
All the Best!