I am not looking for a top school score, just something decent in the mid 600's. I have been out of school for 12 years and I am looking to go to Grad school in the fall.
Is it possible to do some test preps and learn this stuff in 1 month?
It depends on how smart you are. Take a GMATPrep test. If you score around 580+ you should be able to hit around 650 with a month's prep.