Hi murilloc,
Since you are aiming for a 700+ GMAT score, you’ll need to raise both your quant and verbal scores; however, it’s not a bad a idea to spend a few weeks working on just verbal, to solidify your foundations, and then continue working on quant. When studying verbal, you want to strive for linear, targeted learning. In other words, you want to master one topic before you move to the next. So focus on learning one section at a time, either reading comprehension, sentence correction, or critical reasoning. For example, when learning about critical reasoning, you want to be able to learn about all aspects of critical reasoning: e.g. 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 follow a similar routine for sentence correction and reading comprehension.
Once you have strengthened your verbal knowledge, layer quant back into your study routine. However, rather than just using
the official guide, I suggest finding a more robust quant resource. While
the Official Guide is a great book because it has official questions from past GMATs, there are not enough questions given about each topic to provide full exposure to all GMAT topics. Additionally, the questions are presented in a random order, so it’s challenging to use the
OG for focused practice. Thus, you should find a quant resource that 1) will provide more exposure to all GMAT quant topics and 2) will allow you to practice one topic at a time. For example, if you are practicing Number Properties you want to make sure that you can practice a variety of questions from that topic, e.g., LCM, GCF, prime factors, divisibility, remainders, etc. The results of that practice will help you to determine how well you have mastered that topic and to determine your remaining weaknesses within that topic. Such focused practice should help you raise your quant score (assuming you are shooting for a 49+).
Feel free to reach out with any more questions, and good luck!!