Hello deepak

There is not a clear cut answer to this question (maybe i am  not be able to answer ) .You have to compare the colleges based upon several factors .first talking about NIRF ranking then clearly IIEST shibpur is better . fee is also slightly less than NIT agartala .In terms of placements I think NIT agartala is better .so try making a list of such factors on a notebook and compare thoroughly .the final decision must be yours ,so research properly.

Best wishes