Hi
ayushman98Welcome to GC! 710 is a good score. Well i am not sure if this is your first ever full test or you have been writing in the past as well. As per my experience of preparation, only official tests can give you a fair idea of you score range. Many test prep companies claim to have score prediction close to real GMAT but personally i prefer official tests. Also consistency among practice test scores is another factor to predict the prep level. for e.g. my verbal score differs from 5-7 points and Q 2-3 points up/down and that gives me tough time. there are lot of debriefs on this forum which you will find very helpful.
Regarding your last 12 days of prep, i am not eligible to comment. Only thing i can recommend is to stay cool, take good sleep before the test day, and conquer. All the best!