Hi there,
To be honest, I don't know if you're going to make a gain of 40-50 points in 3-4 days. It's just not realistic. The question you have to answer for yourself is WHY the Verbal is "holding you down"? Are there SC concepts you don't know as well as you think? Is there a certain type of CR question you always find yourself getting wrong? Are you falling apart on harder RC Inference Q's? I would select 3 concepts or Q-types for Verbal -- the things that you're having the most trouble with, and ONLY focus on those in the next 3-4 days. You can't go back and do EVERYTHING in such a short amount of time, but you can target 3 things effectively. For example, your 3 things might be SC - Meaning, RC - Main Idea, and CR - Weaken if those are 3 areas where you get a lot of questions incorrect. Or, if you've got a handle on one Q-type (let's say SC is no prob for you), then you might focus only on the other two (RC and CR in this case).
Long story short, 3-4 days isn't much time, but if you really hone in on mastering 3 weaknesses and re-evaluating your strategic approach to all of the Verbal q-types, you've got a shot!