Hi Nis20,
Many GMATers spend 3 months (or more) of consistent study time before they hit their 'peak' scores, so if you've been studying for just 1.5 months, then you likely have not put in enough time and effort yet to perform at a consistently higher level. The variations in your Quant and Verbal Scaled Scores are likely the result of lucky/unlucky guesses and little mistakes (that you either made or did not make) on each Exam. If your Score Goal is still a 700 - and you plan to continue studying until you earn that type of Score - then trying to improve by 130+ points in just 15 days is likely too difficult to be considered realistic. While there's no harm in taking the GMAT in 15 days, you would almost certainly end up paying to take it again later on - meaning that you could potentially save some time, money and frustration by pushing back this Test Date.
1) What is your current Score Goal?
2) When are you planning to apply to Business School and what Schools are you planning to apply to? If it's sometime soon, then what specific application deadlines are you facing?
GMAT assassins aren't born, they're made,
Rich