Hope you are well. Great job on the improvement! Did you self-prep for your most recent exam? What materials did you work through? I think you can get to 600. 2 months is a lot of time (depending on what else you have going on in your life). If you don't feel too burnt out and can give another push then it's certainly not going to hurt you to give the GMAT another shot. If you are feeling overwhelmed then just work on the apps - you are close enough:) But if you do have the energy then why not give it a shot? What was the breakdown on the last exam? Is there anything in the GMAT that you find particularly challenging? Any topic or question type that you don't do well on? Let's see if we can find some easy stuff for you to focus on to get those 30 points.
"It is a curious property of research activity that after the problem has been solved the solution seems obvious. This is true not only for those who have not previously been acquainted with the problem, but also for those who have worked over it for years." -Dr. Edwin Land
GMAT Sample Questions to assess your GMAT Quant.
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IMPROVE YOUR READING COMPREHENSION with the ECONOMIST READING COMPREHENSION CHALLENGE:
Here is the first set along with some strategies for approaching this work: http://gmatclub.com/forum/the-economist-reading-comprehension-challenge-151479.html