Hi Vishwa.
I can only speak for the PrepCast simulator exams as that is what I used to prepare for my exam. I'm not sure which mock exams you did but assuming you used the PrepCast simulator, an average score of 70% is still not good enough to pass the real PMP exam. This is what I would recommend that you do:-
1) Go back to the mock exams that you did and review the questions that you got wrong and UNDERSTAND why your answer was wrong and why the correct answer is correct.
2) On the mock exams you did, go through the questions that you had marked for review. (Hopefully, the mock exams you took had the mark for review feature, just like in the PMP simulator). A question that you marked for review means that you were unsure and you need to understand the concept better. This is regardless of whether you got the question right or wrong. If you got it right it might have been a lucky guess, you need more than luck for the real PMP exam.
3) Lastly, quickly go through the questions you got right.
# As a rule of thumb, it should take you twice as long to review a mock exam than the time it took you to do the test. I would also highly recommend that you use the timed mode whenever you do any mock exam as this primes you to be able to finish your real PMP exam in good time.
# The suggestions, I have listed above may seem tedious and boring but they are the best way to prepare for the PMP exam.
I hope this helps. I wish you the very best in your PMP exam.