Hey kirti!

Your rank is so good and as it is your general rank , its really so good. And if we consider the previous cutoffs for BHU  which was 72 for general category candidate , you have good chances to get a seat for M.sc zoology. Also , you have received a call letter , then you can surely expect a seat there.

You can check the cutoffs for BHU by following the given link :

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