Those who are planning to take the test.
Read the student guide-1 atleast 4-5 times and practice IORM as many times as possible. Most of the questions are scenario based and difficulty level was easy to moderate .
From student guide-2 read the best practices and migrations, there was only one to two questions on monitoring so I wouldn't spend much time on guide-2 on the monitoring side.
Anyway it was easy and finally passed the test with 88% and now I am Oracle certified specialist..
Good luck everyone.