Oh, good - lucky you! Yes, I think this Section Select (or whatever they're calling it) is really a great thing - I hope the tests go well and they offer it to everyone in future!
If you do want to do some tutoring, then a month is just about enough time to get some targeted help. It wouldn't be enough for someone just starting out or for someone who needed a large score increase, but you're looking at a more targeted situation and you have lots of data.
Fill out the private tutoring form here to get started in the system:
https://www.manhattanprep.com/gmat/prep/tutoring/You aren't commiting to anything just by filling that out - you can change your mind! But that will help get the ball rolling. I will send an email to our tutoring coordinator with your name and tell him to keep an eye out - if you do fill it out, I will ask him to tell me who's available and then I can recommend a specific person.
I hate to just recommend tutoring because I know how expensive it is. But in your case (720 to 750, have already studied a lot, only have a month, etc), I really do think that the best thing is to get someone who can dive into that data and really diagnose what's going on and figure out exactly what will give you the best chance of adding a few more points. It's so hard at that level, because a 720 is already amazing!
In general, just remember this: even at a 750-level, you're not going to get everything right. Your goal is not to study every last possible thing so that you could try to get everything right. You will be offered some really hard problems and you will still need to be able to decide which ones to let go. (And you will also need to be really anal and systematic about everything, because you can't afford to have many careless mistakes or holes in your foundation at that level.)