Studies can be plural or uncountable depending on the context. What do you think about:

1. How's your studies?

2. His studies revolves around...


1. How's your studies? I'd say How's your studying?

2. His studies revolves around.. I'd say His studies revolve around . . .

Students: Are you brave enough to let our tutors analyse your pronunciation?

How are your studies?

How is your study going?

His studies revolve around...

Oh, actually I misread it; the uncountable form still refers to study (singular). Studies are always plural.