'Donde Estudias?' means 'Where do you study?'
I think you mean Donde which is Where (in english)
hola donde estas
¿dónde estás? means where are you?
'Donde estas ahora' = Where are you now
Donde = when The other words are not (or don't look) Spanish
"Where does it stay?"
It means "where do you pay?"
where are you from
Where were you (familiar) born?
Y donde queda eso means "and where is that located" !
"No sé donde" can mean two different things in English. As a phrase, it can mean "nowhere", i.e. "Está en no sé donde." -- "It's nowhere." It also functions literally as "I don't know where...", i.e. "No sé donde está tu cámera." -- "I don't know where your camera is."
where were you a student?/where you were a student :)