Hello, 

As per your requirement, i would say that there is mothing such as male vacancy. The vacancy is for both gender basically. 

Now coming to getting a seat in the college, then the vacancy will depend on total no of students to seat ratio, cut off, your marks of the entrance exam, caste reservation etc. Not on gender male or female. It will even not depends on your hs marks as you have mentioned 80% rather your entrance exam marks will only matter as you will get admission as per your rank. 

Good luck