Hi Srinivas,
I hear your disappointment, but 72% in the first two mock exams is not bad at all! And you have plenty of time until Dec 23rd to keep working on that and improve your performance!!
It is already a good starting point that you are able to nail it down to two options. My recommendation for you when you get to review the answers, is to focus on the detailed explanation provided for both the correct answer and the wrong ones: I learned a lot from this process. It is time consuming, but totally worth it.
I am sure you will get better over time!
Gabriella