Hi Scuba11,
90 days is a good enough time to improve your verbal score. If you are willing to study dedicatedly for that period, you are sure to achieve your goal in verbal. I believe you may benefit from taking an additional course in Verbal. If you are willing, there are some great GMAT prep companies that can help you with your preparation.
In order to make an informed decision I would highly encourage you to go to their websites and try on their free trial and decide for yourself which one do you like better. Further I see you are a new member here at GMATCLUB and when you sign up at GMATCLUB you get a free 3 days access to EMPOWERgmat course. In fact it is the only way to get the deal which is very kool.
Further I would highly encourage you to consider
e-gmat verbal online or the
e-gmat verbal live course. They are both amazing courses especially designed for non-natives and they are both within your budget. They offer almost 25% of their courses for free so you can try out their free trial to decide which one you want to go for. Plus the
e-gmat Scholaranium which is included in both the courses is one of the best verbal practice tools in the market.
Lastly I would also encourage you to purchase the latest version of
OG and the verbal review for some great additional practice. Here is a link that will help you with your decision.
https://gmatclub.com/forum/best-gmat-ve ... 68383.htmlHope this helps. All the best.