Turkish,
It looks like you spent an intensive month but didn't get the results you were looking for. A 560 to 750+ is a big jump. I'm guessing the 560 was an official score?
The fact that you spent effort with those resources and hit a ceiling suggests that there's something else that's missing. I believe that could come from several factors -- imbalance of verbal/quant score, slow thinking process, lack of clear-cut 100% solid strategy.
These are areas we focus on at GMAT Pill and I invite you to take a look at the
1 month study plan and to check out the videos on our site where we communicate the strategy for approaching questions in the most efficient and accurate manner.
The goal is to focus on what matters -- and train your mind to avoid the booby traps and to re-read questions and make sure you are answering the question -- not something that sounds related to it. And also, video is a good way to learn from experts. Books are good for skimming -- but when it comes down to thinking strategy, there's no better way than sitting there right next to an expert as he solves the question.
But do your research, look at the testimonials and read through them. Many of them are email snapshots to give a sense of the direct communication with students.
Here are some RC Videos with a unique approach:
https://www.gmatpill.com/gmatpill-releas ... -guide-rc/The home page on GMAT Pill has access to other free PDFs and videos for the other sections if you're interested.