I applied to this university on Dec 15 which was the deadline itself. I have been waiting so long. On April 28, I got an email from the head of the department. He said we have reveiwed your application but we have a question. He was asking about my GPA. I had my master from UK and the grade system there is totally different from that of USA. So he asked me to explain the difference. I replied to his email the same day but I have not got any news from him so far. Should I email him asking a