I have a similar problem, started from 600 and have reached 650 in mock, yesterday i registered for the
egmat verbal online course after taking their free trials. Take their free trials, see if you like it. What is your target split and your target score. 10 days is very short to improve drastically. However, i have seen a couple of guys improve 8-10 points in verbal with an overall spike of 80-100 points in GMAT in 10 days, visit Share GMAT experience and see how they did it. Since our workex is on a lower side i believe we should target atleast 700 in GMAT, that said and done depends how motivated are you to improve your score. Think about the possibility of not achieving your desired score as well. Contingency plan, will you be willing to take GMAT again and apply in the R2 deadline? Hopefully you wont need it but still keep that option open as well. Honestly knowing the concepts in SC is easy but when it comea to identification of errors under timed pressure its a different game.
Egmat talks about Meaning, Error analysis and process of elimination, whats your mock score split? Not just Quant and Verbal but DS, PS, SC, RC, and CR. check on thr accuracy rate of each section and then decide a strategy to go ahead with each question, did u maintain an
error log? If no then please go back to the questions you have answered and review your mistakes.
Also remember GMAT prep 3 scores are spiked since you have already seen many questions there. Would advice you to consider your score as average of 1 and 2 and
MGMAT and then see wherr you are and where you wanna reach. How much time and effort you need to reach there.