Sir my mark is 94 and general rank is 94, open male rank is 73,I have received the call letter...can I get admission in msc math in bhu?

Hi,
Firstly I would congratulate you on getting your entrance exam results. If you have received a call letter, mostly you have passed their criteria and hence are eligible for admission. Speaking about Math department, I woukd recommend you to directly go there itself for the counseling and then see if you can go through, because the cutoffs might change last moment.
Good luck