Hi bharathitman,
Given that you only put in about 15 days of serious prep, a 690 is a fantastic start! However, moving forward, you may consider a more organized study routine. When devising a new plan, you must remember that GMAT is such a challenging exam because there are relatively few questions asked in a given exam, yet those questions come from a huge topic pool. Thus, the best way to get a great GMAT score is to have a thorough understanding of all the topics that may be tested on the exam. To develop such mastery, you want to strive for linear, targeted learning and follow that with focused practice. In other words, you want to master one topic before you move to the next.
For example, when studying verbal, focus on learning one section at a time: reading comprehension, sentence correction, or critical reasoning. When learning about critical reasoning, for example, you want to be able to learn about all aspects of critical reasoning: strengthen and weaken the conclusion, resolve the paradox, find the conclusion, must be true, etc. Follow up your learning with focused critical reasoning practice, so you can determine your specific weaknesses within that topic. You should do the same for sentence correction and reading comprehension.
For quant, since you already scored a 48, you might consider following a similar but slightly altered approach that consists of more targeted practice. For example, if you are reviewing number properties, be sure that you can practice 50 or more questions just from Number Properties: LCM, GCF, units digit patterns, divisibility, remainders, etc. The results of that practice will help you determine your weak areas within that topic. Once you find and fix your weak areas, then move on to the next quant topic. To help diagnose your GMAT quant strengths and weaknesses, I welcome you to take my free
37-question quant diagnostic. After completing the diagnostic, you will be provided with a detailed analysis of your proficiency level in all GMAT quant topics, as well as an opportunity to discuss your diagnostic results with me or another TTP instructor/coach.
Also, I see that for your initial GMAT you studied a lot with the Official Guide. While the Official Guide is a great book because it has official questions from past GMATs, it has limited instruction and does not provide full exposure to all GMAT topics. Thus, for your retake, you may consider seeking out a more robust prep resource, such as an online self-study course that provides sufficient targeted practice for you to discover and fix your weak areas.
Finally, once you feel you have improved your quant and verbal weaknesses, resume taking practice exams. After each practice exam, analyze your wrong answers to determine remaining weaknesses, and spend some time fixing those issues. Unless you have already exhausted them, take practice exams from MBA.com. When taking those exams, be sure to emulate the test-day experience as much as possible: take the test in a quiet environment, only take the allotted breaks, complete all the sections.
Feel free to reach out to me directly if you have any further questions.
Good luck!