Here in my country, the eleventh graders are spilt up into fields like Commerce ,Medical , Non-Medical , Humanities. . So here's some basic knowledge:
Commerce: Business Studies, Economics, Math, Entrepreneurship. . Medical: Physics, Chemistry, Biology, Psychology.
Non-Medical: Physics, Chemistry, Math, IP
Humanities: History, Sociology, Psychology/Economics, Political Science.
So someone comments:
She's in Commerce. (She took Commerce and she studies it)
Is the use of "in" natural?
And here's another context
A girl asks me about another girl, so can I say
She's in Math.
She's in the Math class.
She studies math and right now, she's in her math class.
So does "in" sound natural here?