Yesterday, I found certview.oracle.com updated my certification status and there was "PASS"!!
PearsonVUE has not updated the status yet, so my status is shown as "TAKEN".
However, I could check my score from the score report.
My score is 395/400. I don't even remember my project in details now, though.
I uploaded the assignment on June 15, and took the essay exam on July 1.
I checked PearsonVUE everyday and emailed to Oracle sometimes.
Today I've got an email from Oracle that I passed the exam finally.
I read Andrew Monkhouse's book for a prep first.
Lots of Q&A from this site were REALLY helpful.
Especially, thanks to Roel De Nijs and Roberto Perillo.
Of course, many posts helped me to make questions clearer and simpler.
Your guide was a lighthouse to me. Thank you.