Sumit,
Addl info I need is your birth date and horoscope. Just kidding.
I think 670 is not a bad score in PR. Personally, I think 670 in PR means you are fairly ready for the actual GMAT. Gmatclub also has a 'score estimator' - you can check that out.
I think that these practice tests are only a index point of your stage of preparedness - but cannot be used as an index to estimate your score in actual GMAT. Dont loose anytime in the next two weeks....who knows these two weeks of further preparation can land you in a 770 in the actual GMAT. All the best.