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Lukas, you should be able to do the studies... Dont worry, with 3 months to go, I am sure you can achieve your target.... KEEP UP THE FAITH DUDE!!!
Anyways, about the material, I think for the score range you are targetting, IMHO PR is a better option. Its simpler and gives more tips and common shortcuts... Also their verbal is better than Kaplan (IMHO)..
I've definitely had students make that type of improvement - but invariably, they put in A LOT of work.
You want to consider getting some help, either through a prep course or by taking a basic math course at your local college. Many low math scorers need a refresher of the foundations before tackling actual GMAT problems, and a college class is great for this purpose.