Dear Student,

Actually it depends upon the position they want to recruit like if they come here for software developer post then definitely they will allow only CSE/IT student to sit campus placement not any other branch. You should also know that Google, Microsoft, Amazon etc. are product based companies and they mostly hire student  from CSE/IT group only.

If you also want a place in this company then you need the develop the required skill and then apply for the off campus placement where your branch doesn't matter, whether you are from mechanical or microbiology, you just need to develop the required skill.

Best Of Luck!!!