Finally, I received my call sign! It was so difficult to get, and I took the high-speed train to Guangzhou on June 29th for the exam. The results were released a week later, and the operation license number came out about a month after that. After waiting for almost another half month, I finally got my call sign on August 16th.
My callsign is BG7NOD.
I plan to take the B license exam again next year and look forward to meeting you in the air, 73.