Hi ps2007,
It's been a little over a month since your original series of posts - at that time, you stated that you were planning to apply for Round 1 this Fall. Is that still the case? If so, then considering the timeframe that you're on, it's not clear why you would be so casual with your studies over the last month. If you want to earn a 700+ score and apply for Round 1, then you will have to stick to a consistent study routine and work hard for the next few months.
Your two scores are close enough together that they provide a reasonable estimate of your current Test-Taking knowledge and skills - if you continue to study in this way, then you will likely continue to score in the 500s. This is all meant to say that you need to make some big adjustments to your routine - right now - to accomplish all of your goals in the timeframe that you described.
1) How many hours can you commit to studying during a typical week?
GMAT assassins aren't born, they're made,
Rich