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 . . .

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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.