No need to try to aim at 70% in your mock practices. Joseph Hogue made this comment, which I agree with:
“We already know that no candidate with a score of 70% or above has ever failed the exam. Other than that, the Institute is pretty quiet on the issue. We also know the pass rates and trend for each of the exams, around 40% for the last five years or so. Knowing that candidates are averaging around 60% on mock exams really only tells us that the actual passing score will probably be somewhere between 61-69%, which we could have assumed anyway.”
Source: http://www.finquiz.com/blog/2012/05/22/mock-exam-madness/
Do your own math. Don’t worry if you are getting 60% or even less. Try to motivate yourself to get through the last bit of time. Relax now, and be yourself on the exam!