hi,

see research fellows post is come for many iits, like iit kharagpur, however in some cases gate score is not mandatory, for research fellow positions iits selects candidates, based on their academic score, final year projects, whether candidate  has  all the relevant skills or not, if you do qualified gate you have an added advantage.

you may also  use careers360 gate college predictor tool to know about your probable college for mtech admission,