Hi Eksha22,
First off, I will say try your best not to over-study. The best thing you can do for yourself is walk into your GMAT as fresh as possible. That said, to try and improve your skills over the next few days you could engage in 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.
For instance, if you messed up 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 GMAT quant skills. Number Properties is just one example; follow this process for all quant, verbal, and DI topics.
Feel free to reach out with any questions.
Good luck!