Hi 12922.
The main thing for you to focus on isn't how many question you should answer but how high you can drive your accuracy.
To get to your score goal, you need to get easy questions correct almost 100% of the time and medium questions correct over 80% the time.
So, for the next 20 days you could focus on accuracy by
- practicing untimed until you achieve high accuracy
- analyzing each verbal question you miss and addressing whatever caused you to miss it, such as a knowledge gap or flaw in execution
- working on answering questions faster after you have achieved high accuracy untimed
On GMAT Club, some questions marked 600-700 level are pretty easy. So, you need to get those easier 600 - 700-level questions correct close to 100% of the time.
Also, make sure you master RC too. Do, RC questions untimed until you are achieving high accuracy consistently, and then work on speeding up.
For some tips on how to practice verbal for best results, see this post.
Three Key Practice Tips for Mastering GMAT VerbalAlso, the general practice tips in this post could be helpful as well.
The Best GMAT Practice Methods