I would suggest to go for mech. / chem in IT Bhu ... even in IIT its difficult ti get plcmnt with pulp& paper tech,. in core industry
In IIT one more advantage is, you can sit for open2 all companies eligiblity with B Tech degree
but thr u have to prove urself for which u need gud communication skills and a gud GPA and some leadership qualities.
but in time, its difficult for you in IITs with this degree and going for non-core companies
I suggest go for mech.chem at IT BHU which has gud plcmnt statistics
all the best
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regards
ramesh