What does “School Day” mean in English mean ? Are there differences between “School Day” and “a school day”?

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There is no School Day, in general.  A school day just means a day at school, a working day, in that sense.   
Hope this helps! :)

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It means exactly that, school day

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A school day is just a day when schools are open, but sometimes adults also use it - or school night - to express a working day (Monday to Friday). For example "I can't stay at the pub too late tonight, it's a school night".

What's the context of "School Day"? Not sure about this one.

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