Hey Aspirant, Admissions in UG courses like B.A, B.com and B.sc in Banaras Hindu University are given on the Basis of an entrance test called BHU CET.

Last years cutoff rank for admission in B.Sc(Hons.) Maths was about 850 and while cutoff marks were about 174.

You can check the previous year cutoffs of other courses by referring to the link below:

https://university.careers360.com/articles/bhu-uet-cut-off

Hope this helps.