Your skill is absolutely above 700. Keep it up, brother! Regarding mock test, I suggest you to start as early as possible. Thus, if you find any problems during mock test, you still have time to improve it.
thanks so much for your encouragement!! I hope that I can get above 700 as you said. Your words gave me confidence.!!! I feel so depressed recently about the test. I will try hard for the last 7 days to achieve the goal. Thanks again.