In that case give yourself two to three months. I am not aware of the standards under Pearson but in the old setup (Prometric) you can easily go up to 49 in Q. It is not difficult. You have an advantage that you know you are weak in Word Problems. My suggestion would be to concentrate on the following:
a. Re-do all word problems in OG-11 and OG-Q.
b. Identify word problems from Kaplan Premier
and Kaplan 800
. They are tough if you go by the standards of GMAT. Do them to gain confidence.
c. Don't go for Princeton. They are not that good.
d. Try the following material. You would get them from Score Top. Though I know they do not always have a lot of regard for copyrights! You can get a lot of good practice material.
- VStudy Books (these are from a Korean site)
- 20 GMAT sets (these are collections of questions)
- Paper GMAT tests (these are also copyright protected)
- GMAT Plus Books (there is a lot of controversy about these books. They are very good for practice but have inaccurate answers and have been in the middle of lawsuits)
- Try the DS and the PS sets that are commonly known as 1000 PS and 1000 DS.
All of these are more than enough to take you to a 49 if you do not make silly mistakes. If you can wait, give yourself 12 weeks before the next attempt. If not, at least wait for 8 weeks.
Do reply if this information helps.