Buraya nereden geliyorsun???
Hayır. woher = wo ... her = "nereden".
"buraya" anlamı cümlede yok.
"Woher kommst du?" Is it grammerly correct. Isn it what they usually say in daily language?
„Woher kommst du?“ is also grammatically correct, but I would be more likely to say „Wo kommst du her?“