Hi OshinFalangie,
Improving from 620 to 705 in just two weeks is not an easy task, but if you work your butt off I think you have a shot. A big part of improving your score in such a short time frame is to find your knowledge gaps and improve your weaknesses. A great way to do this is with topical practice.
For example, let’s say you want to practice Number Properties. You can do so by answering 50 or more questions just from Number Properties: LCM, GCF, units digit patterns, divisibility, remainders, etc.
After each problem set, it's crucial to delve into the questions you answered incorrectly. For instance, if you stumbled on a remainder question, take a moment to reflect. Was it a careless error? Did you fail to apply the remainder formula correctly? Was there a concept in the question that eluded you? This analysis is key to your learning process.
By carefully analyzing your mistakes, you will be able to fix your weaknesses efficiently and, in turn, improve your GRE quant skills. Number Properties is just one example; follow this process for all quant and verbal topics.
For some additional advice, feel free to check out the following article:
The Best Way to Study for the GMATI’m here if you have any questions.