what is the rank need to join in iit college through gate

I would suggest you to give Gate exam as this will open 2 doors for you, first one is for M.Tech and second one is you can try for PSUs as well. But there are many students who go for MBA after B.Tech because they have more interest in management field. So basically, it depends on your interest and potential. Also you can go through the below provided link to know the cut off IITs and branch wise -

GATE Cutoff for IITs

Hope this helps!!!

To get into top IIT's like IIT Bangalore, Kharagpur aim below 600 rank in GATE and IIT's like IIT Roorkee, BHU. Guwahati, aim below 1000 rank.

In IIT Hyderabad, Patna aim below 1500 rank.

Rest cutoff details for all IIT's you can check in the link below:

IIT Cutoff through GATE

Good luck!