Hi

It's quite difficult to predict the whether you will get a seat for bsc maths or not in bhu as  cut off ranks / marks for the same keeps changing every year depending upon various factors like number of students that appeared in the exam, kind of marks obtained by them , toughness level of the examination etc

But yes as per previous year trends , with 750 sc rank  you may not get a seat in BHU for your BSc maths

For example,
In BHU UET examination 2018 , an sc category student required a rank of 481 marks to get a seat in BHU for BSc maths

Even with 114 female sc rank, you  have  very low chance

For detailed information go through

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

Thank you