I had studied Enligsh before 2 O'clock means you did study english, but you are not anymore. But it's more complicated that so: had studied means that you studied English sometime ago and that it is "done" now. A more appropriate example would be "I had studied English in High School".
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alkendiI had studied English before 2 O'clock.That statement is true if, in fact, you had studied English before 2 o'clock. Is that when you studied? Only you can answer that. Yes? Then the statement is true because it corresponds to the facts.
if it is true:why and if it is false: why