It means: "academic classes that you study this year"
Estudias. = You study.
It means what classes are you taking this semester?
It means "How many books for your classes this semester?"
¿Qué estudias? is "What are you studying?"
What clases do you have
"Por qué estudias español" means "Why do you study Spanish" in English.
It is Spanish for "how often do you study"
'Donde Estudias?' means 'Where do you study?'
"Este fin" = this end
"Tengo dos clases" means "I have two classes" in English.
este dia = this day = today
' Cuales materias estudias' = 'What subjects are you studying' as a question, or '....which subjects you are studying' as a subordinate clause.