Hello Deepak Solanki!

There is no campus placement for undergrad student from Science stream in BHU. In fact I doubt any university or institute in India can arrange campus placement for plain Bsc Hons students. You need to either go for higher studies like Msc/MCA/MBA etc which can give campus placement, or appear for job exams like PO, civil service, SSC, CDS etc. Good news in BHU there are multiple aspects which can help you prepare better for further exams or jobs. Like you can join NCC/NSS/Foreign language which can help you in further steps.

All the best!!