Hello Sia,
from teh scores you have listed, I can say you are on the right track to pass the exam and earn your PMP. Oliver questions are known to be more complex and people usually score less in these questions.
I would recommend to use the remaining time wisely to reassure the knowledge you have and fill the gaps you discover during practice.
I have my exam due in the fourth week of jan and my scores have been as follows.
Prep cast( Exam 1)-84%
PM Study( Exam 1)-77%
Head first - 78%
Oliver 75 questions - 63%
Prep cast ( Exam 2) - 83.5%
I am a bit concerned with my oliver scores. Unlike a lot of people that recommend reading Rita, I found it rather wordy. I have strictly been using the PMBOK guide to understand my gaps.
Training for Project Management Professional (PMP)®, PMI Agile Certified Practitioner (PMI-ACP)®, and Certified Associate in Project Management (CAPM)®