NIT

For IIT, it is 75% and is the easiest part of it. If you want to join IIT, you need to crack JEE Mains and JEE Advanced as a good rank in advanced can get you a seat in IIT. Though you must be eligible for NIT if you get your expected marks, but to get a seat there, you need to perform well in JEE Mains.
All the best.

You have not mentioned the course for which you want admission. As for B.Tech you need to qualify JEE Mains and a good rank in the exam can fetch you a seat, for M.Tech you need to have a good rank in GATE for different courses offered there are different entry scheme.

You are eligible for NITs like MNIT Jaipur, NIT Silchar, and NIT Kurukshetra but not for NIT Warangal because for pursuing MBA from NIT Warangal one must have an engineering background.

Batch 2016-18 is 50% placed as of now with an average package of 6 LPA. ROI is good.

Please go ahead and call them back.
All the best.

First of all, congratulations, for scoring 480 marks in GATE. With that score, I am sure you can apply in all IITs and NITs. Still, you have to wait till they announce their cut-off list. It changes every year.

For top NITS, above 100 marks is required.

Rank upto 30k and 160 and above marks for general category is required.

So, a rank under 10k to15k can fetch you a top NITs. Accordingly your score in JEE Mains Paper 1 should be more than 180+ (200+ to be on the safer side) at least. For lower ranked NITs 150+ is a must.