Hey Budala!
(You don't have to answer my foolish questions) Seriously now, the male/female student ratio will depend a great deal on what country the school is in ----USA, UK, India, ...etc
and it will depend on what kind of school it is.
In the US, for example, if a business school is at university level, offering an academic-level Bus. Ad. degree it will probably have roughly equal or slightly more male students.
But if it is a high school or junior-college level school, then it will be teaching basic skills like secretary skills and accounting---basically how to qualify as an assistant, clerical staff person. And those jobs traditionally were taken by women (because of traditional stratification) and probably still are. So you might find slightly more female students at such a school. I actually don't know first hand. I'm just guessing.
But you'd have to narrow down your question, I think, in order to get someone to answer who has firsthand experience. Like say what country you mean. Because the education and employment picture varies from one society to the other.