It's possible to score in the 700 range, but it will require a great deal of work. You'll probably have to sacrifice any free time or social life, but it's only for one month. I think that the effort and time will be worth it. The weekend hours are decent, but the weekdays could be increased too. Try to squeeze in three hours on those days. Even if you're exhausted from question practice or CAT's, at least do
something. For example, reading all the
OG explanations or re-reading a guidebook is a productive exercise.
I'm usually not a big fan of CAT's. The GMATPrep is usually sufficient for most people, though throwing in the Manhattan tests is fine too. You're approaching the test date, so it's important not to cram in a bunch of practice tests. This can lead to fatigue.
For math, look into the
GMATClub tests. Those will improve your skills for sure. The main target for you now, however, is verbal. Get hardcore with this, as verbal provides the biggest opportunity for you to earn points (given your current level). The verbal forums are best for SC practice, along with the
OG. For CR and RC, look into LSAT questions and finish the
OG. I keep mentioning the
OG books because it seems that you didn't completely finish all three books. If that is so, please complete them as soon as possible. Also for verbal, re-read the Manhattan SC guide. Just keep reading it over and over.