Hi Pachio,
It takes many GMAT test takers 300+ hours to score a 700+. Since you have only been studying for 3 weeks, with continued motivation and more dedicated study, I believe you can hit your verbal score goal.
Remember, the 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 and targeted learning and follow that with focused practice. In other words, you want to master one topic before you move to the next. Have you been able to do this?
When studying verbal, focus on learning one section at a time: 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: 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. Do the same with sentence correction and reading comprehension.
In regard to next steps, you may consider finding some “fresh” prep materials, rather than re-doing the official guide questions that you have already completed.
If you have any further questions, feel free to reach out.
Good luck!