I need a lot more information in order to advise you. :)
In general, you already got a 460 and your goal is 500+, so you're not that far from your goal. But how much have you studied recently - are your skills still at a 460 level or have they dropped? (This can happen if you haven't been studying.)
What is your current scoring level? Did you take that practice test under 100% official conditions, including essays and length of breaks? How long ago?
Use this article to analyze the test and then come back here to share your analysis:
http://www.manhattangmat.com/blog/index ... ice-tests/If you haven't taken a practice test yet, take one tomorrow. Everyone should do this, but you especially, because you don't have much time. How do you know what to review or study? You can't review everything - you don't have enough time. Take a practice test and the results will tell you where to concentrate your efforts.
What materials do you have? What have you already done? How have you been studying - on your own, with friends? Did you take a class or work with a tutor? How are you planning to study over the next 3 weeks?
You mention timing problems, so read these two articles and start doing what they say:
http://www.manhattangmat.com/blog/index ... to-win-it/http://www.manhattangmat.com/blog/index ... anagement/Note: you mention finishing early on quant. If you finish more than 3-4 minutes early, then you do have a timing problem on quant as well. It can be very problematic to go too fast - you make lots of mistakes on things that you did know how to do.