Do companies discriminate students of mediocre NIT and top 5 NIT for placements ?
Dear Aspirant,
It is true that in top NIts more or better companies came but every student have enough chances of getting placements in all most all Nits. It's totally depends on Your talent and that's what a company want. If you are talented and skilled enough then you might grab any company even if you are from lower colleges as you might know some examples too.
So stop thinking about what companies comes to your colleges and start working on your skills.
Good Luck for future!!